***UPDATED 3/5***

Read HuffPost's OffTheBus Superdelegate Investigation to find out more about the superdelegates who are likely to decide the Democratic nomination for president.

RESULTS

Vermont
DEM: Obama 60%, Clinton 38% (Precincts reporting 86%)
GOP: McCain 72%, Huckabee 14%, Paul 7% (Precincts reporting: 86%)
Read Full Vermont Results Here

ABC News Vermont Delegate Count:
Obama 9, Clinton 6
McCain 17, Huckabee 0, Paul 0

Ohio
DEM: Clinton 55%, Obama 43% (Precincts reporting: 91%)
GOP: McCain 60%, Huckabee 31%, Paul 5% (Precincts reporting: 90%)
Read Full Ohio Results Here

ABC News Ohio Delegate Count:
Clinton 70, Obama 59
McCain 85, Huckabee 0, Paul 0

Texas Primary
DEM: Clinton 51%, Obama 47% (Precincts reporting: 85%)
GOP: McCain 51%, Huckabee 38 %, Paul 5% (Precincts reporting: 91%)

Texas Caucus
DEM: Obama 55%, Clinton 45% (Precincts reporting: 34%)
GOP: No GOP Caucus in Texas
Read Full Texas Results Here

ABC News Texas Delegate Count
Clinton 30, Obama 20
McCain 90, Huckabee 0, Paul 0

Rhode Island
DEM: Clinton 58%, Obama 40% (Precincts reporting: 98%)
GOP: McCain 65%, Huckabee 22%, Paul 7% (Precincts reporting 98%)
Read Full Rhode Island Results Here

ABC News Rhode Island Delegate Count:
Clinton, 13, Obama 8
McCain 13, Huckabee 4, Paul 0

McCain To Visit White House On Wednesday
CBS News is reporting in a breaking news email to viewers:

After projected wins in tonight's Texas, Ohio, Vermont and Rhode Island primaries, CBS News has learned Sen. John McCain will travel to the White House tomorrow where he is expected to receive the endorsement of President Bush, according to Republican officials.

Huckabee Out

Mike Huckabee's campaign emailed this statement to reporters at 1:35am ET on March 5, 2008:

Former Arkansas Governor Mike Huckabee concluded his 2008 bid for the Republican nomination for President tonight, calling upon his supporters to embrace the candidacy of U.S. Senator John McCain (AZ). Huckabee, a champion of conservative values, said: "I extend my congratulations - and my commitment to John McCain and the Party - to do everything possible to unite our party and our nation, to be the best country we can be, not for ourselves, but for future generations. I am grateful that Senator McCain has led an honorable campaign because he is an honorable man." "It's now important that we turn our attention, not to what could have been or what we wanted to have been, but what to now must be, and that is a united party," Huckabee stated in his speech to supporters gathered in Texas tonight. Huckabee said, "Not only have we fought the good fight and finished the race but more importantly, we have kept the faith. I would rather lose an election than lose the principles that got me into politics in the first place." "While many in the establishment never really believed I belonged, there were many in the country that did," he said. "Thanks to their sacrifices, I had a voice - and I only pray that I have been able to give them a voice." Huckabee said he represented average Americans who work two jobs to meet ends meet; conservatives who want less - but more efficient - government with less corruption; people who believe we should overhaul our tax system, implement the Fair Tax ad and get rid of the IRS; the Solders, Sailors, Airmen and Marines, who keep us free; those who cherish life and those who have yet to be born. Huckabee, who ran an extremely small but cost-effective campaign, concluded his remarks by stating, "Our battle was never about us. It was about our country and its liberty. Now, we join with Senator McCain in the rest of that battle, not for who gets elected, but for what we can do when we get elected." Huckabee finishes the race with delegates from his victory in eight primaries and caucuses. He won caucuses in Iowa, West Virginia, and Kansas. Huckabee also won primaries in Alabama, Georgia, Tennessee, Louisiana, and his home state of Arkansas.

First Exit Polls:

VT Obama - 67, Clinton - 33
OH Obama - 51, Clinton - 49
TX Obama - 50, Clinton - 49
RI Obama - 49, Clinton - 49

But National Review's Jim Geraghty has different results:

For the first set, Obama is up by 2 percent in Ohio, Hillary is up by 2 percent in Texas, Hillary is up by 3 percent in Rhode Island and Obama is up by a 2 to 1 margin in Vermont.

AP:

-In the GOP race in Ohio, independents were about one in seven voters, in Texas one in five.

-Roughly six in 10 Democratic voters Tuesday said superdelegates should vote based on results of the primaries and caucuses rather than for the candidate they think has the best chance to win in November.

-A whopping eight in 10 in Ohio's Democratic primary said international trade takes more jobs from the state than it creates.

-One in seven Obama voters acknowledged Clinton as more qualified to be commander in chief; fewer than one in 20 Clinton voters said that about Obama.

-Four in 10 Clinton voters in Ohio and Texas said Obama inspires them about the future of the country.

The second set is similarly close - Hillary up by 2 percent in Ohio, the two Democrats tied in Texas, Obama ahead by 2 percent in Rhode Island and a similar 2 to 1 margin in Vermont.

From MSNBC:

Ohio: 81% think NAFTA takes jobs, 8% says it creates jobs, 7% think it has no effect.

(in 2004, 72% thought it took jobs, 13% thought it created, 8% thought is had no effect).

Texas: 59% think NAFTA takes jobs, 24% says it creates jobs, 12% think it has no effect.

(in 2004, 62% thought it took jobs, 12% thought it created, 15% thought is had no effect).

From CNN:

Hillary Clinton holds a two-to-one advantage over Barack Obama with Hispanic voters in Texas, while blacks are overwhelmingly supporting him in Tuesday's Democratic presidential primary, according to CNN's exit poll.

These early surveys provide a snapshot of the race, but are not conclusive on who will win this critical contest. Eighty three percent of blacks voted for Obama, while 16 percent supported Clinton, according to the exit poll. Meanwhile, 64 percent of Hispanics backed Clinton, while 32 percent went for Obama.

List of Poll Closing Times from Taegan Goddard's Political Wire.

Vermont: 15 Democrat, 17 GOP delegates at stake; Polls close at 7 pm ET

Ohio: 141 Democrat, 85 GOP delegates at stake; Polls close at 7:30 pm ET

Rhode Island: 21 Democrat, 17 GOP delegates at stake; Polls close at 9 pm ET

Texas: 193 Democrat, 137 GOP delegates at stake; Polls close at 9 pm ET. Caucuses then begin after the polls close.

Keep reading about today's primaries:

WASHINGTON -- Barack Obama and Hillary Rodham Clinton contested primaries in Ohio, Texas and two other states on Tuesday, the front-runner and his pursuer in a riveting race for the Democratic presidential nomination. John McCain reached out for the Republican delegates needed to secure his nomination after a decade's struggle.

In all there were 370 Democratic delegates at stake in Rhode Island, Vermont, Ohio and Texas, which uses an unusual primary-caucus system.

After 11 straight victories, Obama had the momentum and the lead in the delegate chase in The Associated Press count, 1,386-1,276.

His margin was larger 1,187-1,035 among pledged delegates chose in primaries and caucuses. The former first lady had an advantage among party leaders known as superdelegates, 241-199.

That left Clinton in desperate need of a comeback with time running out _ if it hadn't already.

Some of her supporters, her husband, the former president among them, said she needed to outpoll Obama in both Texas and Ohio to sustain her candidacy.

Without conceding anything, Obama's allies said even that wouldn't be enough, given his lead in the delegate count and party rules that virtually assure primary losers a significant share of the spoils.