By JULIE PACE AND CALVIN WOODWARD, ASSOCIATED PRESS

CHARLOTTE, N.C. — President Barack Obama goes before the Democratic National Convention and the nation on Thursday for a capstone speech designed not just to persuade undecided voters to swing his way in a tight election but to put fire in the belly of his supporters and get them to come out on Election Day.

Obama senior adviser David Plouffe promised the president would give voters "a very clear sense of where he thinks the country needs to go economically, the path we need to take." But he also cautioned that no one should expect Obama to slingshot out of his convention with a big boost in polls that have long signaled a close race.

"We've always believed that there's very little elasticity in the election," said Plouffe, up early to preview the president's speech on morning talk shows, adding: "You're not going to see big bounces in this election. For the next 61 days, it's going to remain tight as a tick."

Citing a chance of thunderstorms, convention organizers scrapped plans for Obama to speak to an enormous crowd in a 74,000-seat outdoor stadium and decided to shoehorn the event under the roof of the convention arena, holding 15,000. That meant no opportunity to reprise the massive show of support, excitement – and on-scene voter registration – from Obama's 2008 acceptance speech before 84,000 in Denver. Republicans said Democrats made the switch because they feared the sight of empty seats.

The GOP keeps nudging Obama supporters to rethink their allegiance to a president seeking re-election in a time of weak economic growth.

The party released a new ad Thursday called "The Breakup," in which a woman tells the president, " This just isn't working ... You're not the person I thought you were. ... I think we should just be friends."

Former President Bill Clinton set up Obama's speech with a rollicking turn on the stage Wednesday in which he offered a strong defense of the president's economic stewardship.

"He inherited a deeply damaged economy, put a floor under the crash, began the long hard road to recovery and laid the foundation for a more modern, more well-balanced economy that will produce millions of good new jobs," said Clinton – the last president to see sustained growth, in the 1990s. "Conditions are improving and if you'll renew the president's contract, you will feel it."

Clinton also preached bipartisanship and a pullback from politics as "blood sport" – this near the end of back-to-back conventions that feasted on rhetorical red meat and even as he ripped the Republican agenda as a throwback to the past, a "double-down on trickle-down" economics that assumes tax cuts for the wealthy will help everyone down the ladder.

Obama campaign strategist David Axelrod, also appearing on morning talk shows, said Clinton's speech had set out the economic choices, "so now the president can talk about the future having some of that underbrush out of the way."

Obama watched Clinton's speech from backstage, then strolled out and embraced him, bringing happy roars from the crowd in his first convention appearance and making for a spirited ending to a trying day for Democrats.

obama democratic convention speechAP Image

After passing their platform a day earlier in a smoothly scripted show of unity, Democrats reopened it Wednesday to restore a reference to God that had been stripped out in earlier deliberations.

Republican rival Mitt Romney called quick attention to the omission, branding it as evidence that the Democrats are a "party that is increasingly out of touch with the mainstream." White House aides said Obama himself ordered the party to get God back in. The platform also was altered to declare that Jerusalem "is and will remain the capital of Israel," a view at odds with a carefully neutral U.S. policy but in tune with campaign sensibilities.

It was no accident the president devoted many stops on a pre-convention tour of battleground states to campus crowds of the sort that lifted him to the Democratic nomination and the presidency last time.

"Barack's challenge here is to sort of wake up America and make them realize how serious this election is," Democratic Rep. Sam Farr of California said in an interview at the convention. Judging from his town hall meetings in August, when only 15 or 20 people showed up instead of the usual hundreds, there is a "big apathy about politics right now," regardless of party.

Farr added, "If we have an apathetic America, I'm terrified."

obama democratic convention speechAP Image

Former Philadelphia Mayor Ed Rendell, a past chairman of the Democratic party who appeared on CBS "This Morning," said he's still worried "about the base turning out to the degree they did" for Obama in 2008. He cited the battleground states of North Carolina and Virginia in particular.

Speaking of the warm-up speeches by the first lady and former president, Rendell added, "The beauty of Michelle Obama and Bill Clinton is they stoked the base."

Motivation was not an issue in the convention hall, at least not when Clinton spoke.

The hall rocked with cheers as Clinton strode onstage to Fleetwood Mac's "Don't Stop," his 1992 campaign theme song, and he held the crowd rapt as he drifted off his prepared remarks for about 50 minutes.

He accused Republicans of proposing "the same old policies that got us into trouble in the first place" and led to a near financial meltdown. Those, he said, include efforts to provide "tax cuts for higher-income Americans, more money for defense than the Pentagon wants and ... deep cuts on programs that help the middle class and poor children."

"As another president once said, `There they go again,'" Clinton said, paraphrasing Ronald Reagan, who often uttered "There you go again" as a rebuke to Democrats.

"In Tampa," said Clinton, "the Republican argument against the president's re-election was pretty simple: We left him a total mess, he hasn't finished cleaning it up yet, so fire him and put us back in."

Clinton's speech marked the seventh consecutive convention in which he has spoken to party delegates, and the latest twist in a relationship with Obama that has veered from frosty to friendly. The two men clashed in 2008, when Obama outran Hillary Rodham Clinton, the former president's wife, for the Democratic presidential nomination. Hillary Clinton, then a New York senator and now Obama's secretary of state, was in East Timor as the party met but made a cameo appearance on the huge convention screens in a video that celebrated the 12 Democratic female senators now in office.

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  • President Barack Obama laughs with his wife Michelle and his daughters Malia and Sasha after his speech to the Democratic National Convention in Charlotte, N.C., on Thursday, Sept. 6, 2012. (AP Photo/Lynne Sladky)

  • President Barack Obama waves with his wife Michelle and his daughters Malia and Sasha after his speech to the Democratic National Convention in Charlotte, N.C., on Thursday, Sept. 6, 2012. (AP Photo/Lynne Sladky)

  • Joe Biden, Barack Obama

    Vice President Joe Biden and President Barack Obama wave to the delegates at the conclusion of Presdident Obama's speech at the Democratic National Convention in Charlotte, N.C., on Thursday, Sept. 6, 2012. (AP Photo/J. Scott Applewhite)

  • President Barack Obama waves with his wife Michelle and his daughters Malia and Sasha after his speech to the Democratic National Convention in Charlotte, N.C., on Thursday, Sept. 6, 2012. (AP Photo/Lynne Sladky)

  • President Barack Obama waves with his wife Michelle and his daughters Malia and Sasha after his speech to the Democratic National Convention in Charlotte, N.C., on Thursday, Sept. 6, 2012. (AP Photo/Lynne Sladky)

  • President Barack Obama waves with his wife Michelle and his daughters Malia and Sasha after his speech to the Democratic National Convention in Charlotte, N.C., on Thursday, Sept. 6, 2012. (AP Photo/Lynne Sladky)

  • President Barack Obama waves with his wife Michelle and his daughters Malia and Sasha after his speech to the Democratic National Convention in Charlotte, N.C., on Thursday, Sept. 6, 2012. (AP Photo/Charlie Neibergall)

  • Obama Accepts Nomination On Final Day Of Democratic National Convention

    CHARLOTTE, NC - SEPTEMBER 06: Democratic presidential candidate, U.S. President Barack Obama stands with his family, (L-R) First lady Michelle Obama, Sasha Obama, and Malia Obama during the final day of the Democratic National Convention at Time Warner Cable Arena on September 6, 2012 in Charlotte, North Carolina. The DNC, which concludes today, nominated U.S. President Barack Obama as the Democratic presidential candidate. (Photo by Chip Somodevilla/Getty Images)

  • US-VOTE-2012-DEMOCRATIC CONVENTION

    US President Barack Obama, First Lady Michelle Obama, daughters Malia (L) and Sasha (C) wave after Obama's acceptance speech at the Time Warner Cable Arena in Charlotte, North Carolina, on September 6, 2012 on the final day of the Democratic National Convention (DNC). AFP PHOTO Stan HONDA (Photo credit should read STAN HONDA/AFP/GettyImages)

  • Barack Obama

    President Barack Obama speaks at the Democratic National Convention in Charlotte, N.C., Thursday, Sept. 6, 2012. (AP Photo/Pablo Martinez Monsivais)

  • US-VOTE-2012-DEMOCRATIC CONVENTION

    Supporters listen as US President Barack Obama delivers his acceptance to run for a second term as president at the Time Warner Cable Arena in Charlotte, North Carolina, on September 6, 2012 on the final day of the Democratic National Convention (DNC). AFP PHOTO Brendan SMIALOWSKI (Photo credit should read BRENDAN SMIALOWSKI/AFP/GettyImages)

  • Obama Accepts Nomination On Final Day Of Democratic National Convention

    CHARLOTTE, NC - SEPTEMBER 06: Democratic presidential candidate, U.S. President Barack Obama speaks on stage as he accepts the nomination for president during the final day of the Democratic National Convention at Time Warner Cable Arena on September 6, 2012 in Charlotte, North Carolina. The DNC, which concludes today, nominated U.S. President Barack Obama as the Democratic presidential candidate. (Photo by Win McNamee/Getty Images)

  • Obama Accepts Nomination On Final Day Of Democratic National Convention

    CHARLOTTE, NC - SEPTEMBER 06: Democratic presidential candidate, U.S. President Barack Obama speaks on stage as he accepts the nomination for president during the final day of the Democratic National Convention at Time Warner Cable Arena on September 6, 2012 in Charlotte, North Carolina. The DNC, which concludes today, nominated U.S. President Barack Obama as the Democratic presidential candidate. (Photo by Streeter Lecka/Getty Images)

  • Obama Accepts Nomination On Final Day Of Democratic National Convention

    CHARLOTTE, NC - SEPTEMBER 06: (L-R) Marian Robinson, Malia Obama, Sasha Obama, First lady Michelle Obama and Second lady Dr. Jill Biden watch as Democratic presidential candidate, U.S. President Barack Obama speaks on stage during the final day of the Democratic National Convention at Time Warner Cable Arena on September 6, 2012 in Charlotte, North Carolina. The DNC, which concludes today, nominated U.S. President Barack Obama as the Democratic presidential candidate. (Photo by Scott Olson/Getty Images)

  • From left, Michelle Obama's mother Marian, Malia and Sasha Obama, their mother Michelle and Dr. Jill Biden, wife of Vice President Biden, listen to President Barack Obama at the Democratic National Convention in Charlotte, N.C., on Thursday, Sept. 6, 2012. (AP Photo/Lynne Sladky)

  • US-VOTE-2012-DEMOCRATIC CONVENTION

    US President Barack Obama as he delivers his acceptance to run for a second term as president at the Time Warner Cable Arena in Charlotte, North Carolina, on September 6, 2012 on the final day of the Democratic National Convention (DNC). AFP PHOTO Brendan SMIALOWSKI (Photo credit should read BRENDAN SMIALOWSKI/AFP/GettyImages)

  • US-VOTE-2012-DEMOCRATIC CONVENTION

    The First family welcomes US President Barack Obama as he delivers his acceptance to run for a second term as president at the Time Warner Cable Arena in Charlotte, North Carolina, on September 6, 2012 on the final day of the Democratic National Convention (DNC). From L-R, first row: Mother-in-law Marian Robinson, daughter Malia, daughter Sasha, First Lady Michelle Obama, Second Lady Dr. Jill Biden and Mrs.Obama's brother Craig Robinson (3rd R, second row). AFP PHOTO Brendan SMIALOWSKI (Photo credit should read BRENDAN SMIALOWSKI/AFP/GettyImages)

  • US-VOTE-2012-DEMOCRATIC CONVENTION

    US President Barack Obama delivers his acceptance to run for a second term as president at the Time Warner Cable Arena in Charlotte, North Carolina, on September 6, 2012 on the final day of the Democratic National Convention (DNC). EDITORS NOTE: Image was shot with a tilt-shift lens. AFP PHOTO Brendan SMIALOWSKI (Photo credit should read BRENDAN SMIALOWSKI/AFP/GettyImages)

  • Obama Accepts Nomination On Final Day Of Democratic National Convention

    CHARLOTTE, NC - SEPTEMBER 06: Democratic presidential candidate, U.S. President Barack Obama claps on stage as he accepts the nomination for president during the final day of the Democratic National Convention at Time Warner Cable Arena on September 6, 2012 in Charlotte, North Carolina. The DNC, which concludes today, nominated U.S. President Barack Obama as the Democratic presidential candidate. (Photo by Win McNamee/Getty Images)

  • Obama Accepts Nomination On Final Day Of Democratic National Convention

    CHARLOTTE, NC - SEPTEMBER 06: Democratic presidential candidate, U.S. President Barack Obama speaks on stage to accept the nomination for president during the final day of the Democratic National Convention at Time Warner Cable Arena on September 6, 2012 in Charlotte, North Carolina. The DNC, which concludes today, nominated U.S. President Barack Obama as the Democratic presidential candidate. (Photo by Chip Somodevilla/Getty Images)

  • Obama Accepts Nomination On Final Day Of Democratic National Convention

    CHARLOTTE, NC - SEPTEMBER 06: Democratic presidential candidate, U.S. President Barack Obama speaks on stage as he accepts the nomination for president during the final day of the Democratic National Convention at Time Warner Cable Arena on September 6, 2012 in Charlotte, North Carolina. The DNC, which concludes today, nominated U.S. President Barack Obama as the Democratic presidential candidate. (Photo by Kevork Djansezian/Getty Images)

  • Obama Accepts Nomination On Final Day Of Democratic National Convention

    CHARLOTTE, NC - SEPTEMBER 06: Democratic presidential candidate, U.S. President Barack Obama speaks on stage as he accepts the nomination for president during the final day of the Democratic National Convention at Time Warner Cable Arena on September 6, 2012 in Charlotte, North Carolina. The DNC, which concludes today, nominated U.S. President Barack Obama as the Democratic presidential candidate. (Photo by Joe Raedle/Getty Images)

  • US-VOTE-2012-DEMOCRATIC CONVENTION

    First daughters Malia (L) and Sasha (C) confer as US President Barack Obama delivers his acceptance to run for a second term as president at the Time Warner Cable Arena in Charlotte, North Carolina, on September 6, 2012 on the final day of the Democratic National Convention (DNC). AFP PHOTO Robyn BECK (Photo credit should read ROBYN BECK/AFP/GettyImages)

  • US-VOTE-2012-DEMOCRATIC CONVENTION

    First Lady Michelle Obama (R) looks over at daughters Malia (L) and Sasha (C) as US President Barack Obama delivers his acceptance to run for a second term as president at the Time Warner Cable Arena in Charlotte, North Carolina, on September 6, 2012 on the final day of the Democratic National Convention (DNC). AFP PHOTO Robyn BECK (Photo credit should read ROBYN BECK/AFP/GettyImages)

  • US-VOTE-2012-DEMOCRATIC CONVENTION

    First Lady Michelle Obama (2nd R) looks over at daughters Malia (L) and Sasha (C) as US President Barack Obama delivers his acceptance to run for a second term as president at the Time Warner Cable Arena in Charlotte, North Carolina, on September 6, 2012 on the final day of the Democratic National Convention (DNC). AFP PHOTO Robyn BECK (Photo credit should read ROBYN BECK/AFP/GettyImages)

  • Obama Accepts Nomination On Final Day Of Democratic National Convention

    CHARLOTTE, NC - SEPTEMBER 06: (L-R) Malia Obama, Sasha Obama, and First lady Michelle Obama listen as Democratic presidential candidate, U.S. President Barack Obama speaks on stage during the final day of the Democratic National Convention at Time Warner Cable Arena on September 6, 2012 in Charlotte, North Carolina. The DNC, which concludes today, nominated U.S. President Barack Obama as the Democratic presidential candidate. (Photo by Chip Somodevilla/Getty Images)

  • Obama Accepts Nomination On Final Day Of Democratic National Convention

    CHARLOTTE, NC - SEPTEMBER 06: Democratic presidential candidate, U.S. President Barack Obama speaks on stage to accept the nomination for president during the final day of the Democratic National Convention at Time Warner Cable Arena on September 6, 2012 in Charlotte, North Carolina. The DNC, which concludes today, nominated U.S. President Barack Obama as the Democratic presidential candidate. (Photo by Alex Wong/Getty Images)

  • Obama Accepts Nomination On Final Day Of Democratic National Convention

    CHARLOTTE, NC - SEPTEMBER 06: Democratic presidential candidate, U.S. President Barack Obama speaks on stage to accept the nomination for president during the final day of the Democratic National Convention at Time Warner Cable Arena on September 6, 2012 in Charlotte, North Carolina. The DNC, which concludes today, nominated U.S. President Barack Obama as the Democratic presidential candidate. (Photo by Alex Wong/Getty Images)

  • Obama Accepts Nomination On Final Day Of Democratic National Convention

    CHARLOTTE, NC - SEPTEMBER 06: Democratic presidential candidate, U.S. President Barack Obama speaks on stage to accept the nomination for president during the final day of the Democratic National Convention at Time Warner Cable Arena on September 6, 2012 in Charlotte, North Carolina. The DNC, which concludes today, nominated U.S. President Barack Obama as the Democratic presidential candidate. (Photo by Chip Somodevilla/Getty Images)

  • President Barack Obama waves to candidates at the Democratic National Convention in Charlotte, N.C., on Thursday, Sept. 6, 2012. (AP Photo/Lynne Sladky)

  • Obama Accepts Nomination On Final Day Of Democratic National Convention

    CHARLOTTE, NC - SEPTEMBER 06: Democratic presidential candidate, U.S. President Barack Obama waves on stage as he accepts the nomination for president during the final day of the Democratic National Convention at Time Warner Cable Arena on September 6, 2012 in Charlotte, North Carolina. The DNC, which concludes today, nominated U.S. President Barack Obama as the Democratic presidential candidate. (Photo by Justin Sullivan/Getty Images)

  • Obama Accepts Nomination On Final Day Of Democratic National Convention

    CHARLOTTE, NC - SEPTEMBER 06: Democratic presidential candidate, U.S. President Barack Obama speaks on stage to accept the nomination for president during the final day of the Democratic National Convention at Time Warner Cable Arena on September 6, 2012 in Charlotte, North Carolina. The DNC, which concludes today, nominated U.S. President Barack Obama as the Democratic presidential candidate. (Photo by Justin Sullivan/Getty Images)

  • Obama Accepts Nomination On Final Day Of Democratic National Convention

    CHARLOTTE, NC - SEPTEMBER 06: Democratic presidential candidate, U.S. President Barack Obama speaks on stage to accept the nomination for president during the final day of the Democratic National Convention at Time Warner Cable Arena on September 6, 2012 in Charlotte, North Carolina. The DNC, which concludes today, nominated U.S. President Barack Obama as the Democratic presidential candidate. (Photo by Justin Sullivan/Getty Images)

  • Obama Accepts Nomination On Final Day Of Democratic National Convention

    CHARLOTTE, NC - SEPTEMBER 06: Democratic presidential candidate, U.S. President Barack Obama speaks on stage to accept the nomination for president during the final day of the Democratic National Convention at Time Warner Cable Arena on September 6, 2012 in Charlotte, North Carolina. The DNC, which concludes today, nominated U.S. President Barack Obama as the Democratic presidential candidate. (Photo by Chip Somodevilla/Getty Images)

  • President Barack Obama applauds before his speech to the Democratic National Convention in Charlotte, N.C., on Thursday, Sept. 6, 2012. (AP Photo/Lynne Sladky)

  • Obama Accepts Nomination On Final Day Of Democratic National Convention

    CHARLOTTE, NC - SEPTEMBER 06: (L-R) Malia Obama, Sasha Obama, and First lady Michelle Obama listen as Democratic presidential candidate, U.S. President Barack Obama speaks on stage during the final day of the Democratic National Convention at Time Warner Cable Arena on September 6, 2012 in Charlotte, North Carolina. The DNC, which concludes today, nominated U.S. President Barack Obama as the Democratic presidential candidate. (Photo by Chip Somodevilla/Getty Images)

  • Obama Accepts Nomination On Final Day Of Democratic National Convention

    CHARLOTTE, NC - SEPTEMBER 06: (L-R) Malia Obama, Sasha Obama, First lady Michelle Obama and Second lady Dr. Jill Biden watch as Democratic presidential candidate, U.S. President Barack Obama speaks during the final day of the Democratic National Convention at Time Warner Cable Arena on September 6, 2012 in Charlotte, North Carolina. The DNC, which concludes today, nominated U.S. President Barack Obama as the Democratic presidential candidate. (Photo by Justin Sullivan/Getty Images)

  • Obama Accepts Nomination On Final Day Of Democratic National Convention

    CHARLOTTE, NC - SEPTEMBER 06: First lady Michelle Obama hughs Democratic presidential candidate, U.S. President Barack Obama on stage during the final day of the Democratic National Convention at Time Warner Cable Arena on September 6, 2012 in Charlotte, North Carolina. The DNC, which concludes today, nominated U.S. President Barack Obama as the Democratic presidential candidate. (Photo by Justin Sullivan/Getty Images)

  • Obama Accepts Nomination On Final Day Of Democratic National Convention

    CHARLOTTE, NC - SEPTEMBER 06: Democratic presidential candidate, U.S. President Barack Obama hugs his wife First lady Michelle Obama during the final day of the Democratic National Convention at Time Warner Cable Arena on September 6, 2012 in Charlotte, North Carolina. The DNC, which concludes today, nominated U.S. President Barack Obama as the Democratic presidential candidate. (Photo by Alex Wong/Getty Images)

  • Obama Accepts Nomination On Final Day Of Democratic National Convention

    CHARLOTTE, NC - SEPTEMBER 06: Democratic presidential candidate, U.S. President Barack Obama waves on stage during the final day of the Democratic National Convention at Time Warner Cable Arena on September 6, 2012 in Charlotte, North Carolina. The DNC, which concludes today, nominated U.S. President Barack Obama as the Democratic presidential candidate. (Photo by Justin Sullivan/Getty Images)

  • Obama Accepts Nomination On Final Day Of Democratic National Convention

    CHARLOTTE, NC - SEPTEMBER 06: (L-R) Malia Obama, Sasha Obama, and First lady Michelle Obama watch as Democratic presidential candidate, U.S. President Barack Obama speaks on stage during the final day of the Democratic National Convention at Time Warner Cable Arena on September 6, 2012 in Charlotte, North Carolina. The DNC, which concludes today, nominated U.S. President Barack Obama as the Democratic presidential candidate. (Photo by Justin Sullivan/Getty Images)

  • Obama Accepts Nomination On Final Day Of Democratic National Convention

    CHARLOTTE, NC - SEPTEMBER 06: Democratic presidential candidate, U.S. President Barack Obama walks on stage to join First lady Michelle Obama during the final day of the Democratic National Convention at Time Warner Cable Arena on September 6, 2012 in Charlotte, North Carolina. The DNC, which concludes today, nominated U.S. President Barack Obama as the Democratic presidential candidate. (Photo by Streeter Lecka/Getty Images)

  • Obama Accepts Nomination On Final Day Of Democratic National Convention

    CHARLOTTE, NC - SEPTEMBER 06: Democratic presidential candidate, U.S. President Barack Obama walks on stage to join First lady Michelle Obama during the final day of the Democratic National Convention at Time Warner Cable Arena on September 6, 2012 in Charlotte, North Carolina. The DNC, which concludes today, nominated U.S. President Barack Obama as the Democratic presidential candidate. (Photo by Streeter Lecka/Getty Images)

  • Obama Accepts Nomination On Final Day Of Democratic National Convention

    CHARLOTTE, NC - SEPTEMBER 06: Democratic presidential candidate, U.S. President Barack Obama walks on stage during the final day of the Democratic National Convention at Time Warner Cable Arena on September 6, 2012 in Charlotte, North Carolina. The DNC, which concludes today, nominated U.S. President Barack Obama as the Democratic presidential candidate. (Photo by Justin Sullivan/Getty Images)

  • Obama Accepts Nomination On Final Day Of Democratic National Convention

    CHARLOTTE, NC - SEPTEMBER 06: First lady Michelle Obama introduces Democratic presidential candidate, U.S. President Barack Obama during the final day of the Democratic National Convention at Time Warner Cable Arena on September 6, 2012 in Charlotte, North Carolina. The DNC, which concludes today, nominated U.S. President Barack Obama as the Democratic presidential candidate. (Photo by Alex Wong/Getty Images)

  • Obama Accepts Nomination On Final Day Of Democratic National Convention

    CHARLOTTE, NC - SEPTEMBER 06: U.S. Sen. Dick Durbin (D-IL) speaks on stage during the final day of the Democratic National Convention at Time Warner Cable Arena on September 6, 2012 in Charlotte, North Carolina. The DNC, which concludes today, nominated U.S. President Barack Obama as the Democratic presidential candidate. (Photo by Alex Wong/Getty Images)

  • Obama Accepts Nomination On Final Day Of Democratic National Convention

    CHARLOTTE, NC - SEPTEMBER 06: Democratic vice presidential candidate, U.S. Vice President Joe Biden waves with his wife Second lady Dr. Jill Biden after speaking on stage during the final day of the Democratic National Convention at Time Warner Cable Arena on September 6, 2012 in Charlotte, North Carolina. The DNC, which concludes today, nominated U.S. President Barack Obama as the Democratic presidential candidate. (Photo by Chip Somodevilla/Getty Images)

  • Obama Accepts Nomination On Final Day Of Democratic National Convention

    CHARLOTTE, NC - SEPTEMBER 06: Democratic vice presidential candidate, U.S. Vice President Joe Biden hugs his wife Second lady Dr. Jill Biden after speaking during the final day of the Democratic National Convention at Time Warner Cable Arena on September 6, 2012 in Charlotte, North Carolina. The DNC, which concludes today, nominated U.S. President Barack Obama as the Democratic presidential candidate. (Photo by Chip Somodevilla/Getty Images)

  • Obama Accepts Nomination On Final Day Of Democratic National Convention

    CHARLOTTE, NC - SEPTEMBER 06: Democratic vice presidential candidate, U.S. Vice President Joe Biden speaks on stage during the final day of the Democratic National Convention at Time Warner Cable Arena on September 6, 2012 in Charlotte, North Carolina. The DNC, which concludes today, nominated U.S. President Barack Obama as the Democratic presidential candidate. (Photo by Alex Wong/Getty Images)

  • Obama Accepts Nomination On Final Day Of Democratic National Convention

    CHARLOTTE, NC - SEPTEMBER 06: Democratic vice presidential candidate, U.S. Vice President Joe Biden speaks on stage during the final day of the Democratic National Convention at Time Warner Cable Arena on September 6, 2012 in Charlotte, North Carolina. The DNC, which concludes today, nominated U.S. President Barack Obama as the Democratic presidential candidate. (Photo by Alex Wong/Getty Images)

  • Vice President Joe Biden waves as he appears on stage to address the Democratic National Convention in Charlotte, N.C., on Thursday, Sept. 6, 2012. (AP Photo/David Goldman)