Liberal economists have long been critical of Paul Ryan.

The conservative Wisconsin congressman, who was announced as Mitt Romney's running mate on Saturday, first drew fire in 2010, when he pitched his federal budget plan as an alternative to President Obama's.

Dubbed the "Roadmap for America's Future," that plan and Ryan's subsequent budget proposals would do things like cut Medicaid and food stamp funding and create a two-tier tax rate system and a voucher-like system for Medicare.

Economist Paul Krugman has been especially vocal in his assessment of Ryan's budget. In August 2010, he wrote a New York Times op-ed titled "The Flimflam Man" and critiqued Ryan's Roadmap, saying:

That is, Mr. Ryan may speak about the deficit in apocalyptic terms, but even if you believe that his proposed spending cuts are feasible — which you shouldn’t — the Roadmap wouldn’t reduce the deficit. All it would do is cut benefits for the middle class while slashing taxes on the rich.

Last year, Krugman criticized Ryan's budget proposals as "ludicrous" and "cruel."

Matt Miller, a senior fellow at the Center for American Progress, was also critical of the Roadmap in 2010, and wrote in the Washington Post:

The CBO says your road map would put spending at 22.2 percent of GDP in 2020 and 23.5 percent in 2040. With revenue capped at 19 percent, that means Paul Ryan stands for deficits that would be 3 percent to 4 percent of GDP for at least the next 30 years, which would balloon the debt by trillions, to 100 percent of GDP from 53 percent in 2009. If you're supposedly willing to make "the hard choices," why wouldn't you balance the budget as soon as the economy is back on track? What kind of "fiscal conservative" has a half-century plan to balance the budget?

Uwe E. Reinhardt, an economics professor at Princeton, criticized Ryan's health care plan. "The specific proposals aside, does the Ryan plan offers anything to control overall health-care spending?" he wrote in April 2011. "No, nor does that appear to have been Mr. Ryan’s objective."

New York Times economist Joe Nocera also weighed in on Ryan's health care plan in May 2011 in an article called "Don't Scorn Paul Ryan":

The Ryan plan, which would give seniors a fixed amount they can use to buy health insurance, would undoubtedly shift the cost burden over time from the government to seniors themselves, making health care far less affordable for millions of people. Ryan says that “empowering” health care consumers will help control costs, but that’s absurd: Medicare itself has far more pricing power than the people who actually need treatment.

And in a Wall Street Journal op-ed in 2011, liberal economist and former vice chairman of the Federal Reserve Alan Blinder was highly critical of the GOP budget and Ryan's proposals:

According to the Center on Budget and Policy Priorities, about two-thirds of Mr. Ryan's so-called courageous budget cuts would come from programs serving low- and moderate-income Americans, while the rich would gain from copious tax cuts. That's courage? This reverse-Robin Hood redistribution is bad enough in the abstract. Coming on the heels of 30-plus years of rising inequality, it is breathtakingly mean-spirited. But was such class warfare necessary to make the budget numbers work?

However, the conservative editorial page of the Wall Street Journal has supported Ryan, writing in August 2010:

Mr. Ryan has one of the few credible plans for rationalizing the federal fisc, and his critics are so vicious because his candor exposes Washington's illusions about the entitlement state while offering a genuine alternative.

More recently, Nobel-prize winning economist and vocal liberal Joseph Stiglitz said in a June 2012 interview with Amy Goodman on "Democracy Now" that Ryan's plan "is weakening our basic economic fiber."

While Romney is already working to distance himself from Ryan on certain budget topics, Glenn Hubbard, dean of Columbia Business School and an economic adviser to Romney, has endorsed both Romney's and Ryan's budget plans, and he drew comparisons between them in an interview with the Daily Ticker in March.

"What both Rep. Ryan's and Gov. Romney's plans have in common is the notion of tax reform: broaden base and lower the rates, both corporate and individual," he said. "[Both] reduce growth in government spending, particularly in entitlement spending the two plans are very similar."

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  • Marco Rubio

    "Throughout his life, Mitt Romney has made great decisions, and choosing Paul Ryan as his running mate is a truly inspired choice. I got to know Paul during my Senate campaign when he endorsed me early on when I was still considered a long shot. Paul Ryan is a courageous reformer who understands our nation's challenges, has proposed bold policy solutions to solve them, and has shown the courage to stand up to President Obama and other Washington politicians trying to tear him down. "The Romney-Ryan ticket is going to win in November because it offers the American people visionary leadership to recapture the free enterprise spirit that has empowered countless Americans to build businesses from scratch and live the American dream. I'm excited about the visionary change a Romney-Ryan team will bring to Washington, and I look forward to campaigning

  • Rob Portman

    <blockquote> "Mitt Romney has made a great choice in Paul Ryan. He is an accomplished public servant and a leading voice on the most pressing issues facing our country. Paul is one of my best friends in Congress and someone I have worked closely with as a former colleague on the House Ways & Means Committee. "Jane and I wish Paul and Janna and their kids the very best. As the Chairman of the Romney campaign in Ohio, I look forward to working with Paul to ensure that the Romney-Ryan ticket carries Ohio and is victorious in November. Most importantly, as a member of the Senate, I look forward to working closely with a Romney-Ryan Administration to restore fiscal sanity and enact pro-growth policies to create jobs."</blockquote>

  • Obama for American Campaign Manager Jim Messina

    <blockquote>"In naming Congressman Paul Ryan, Mitt Romney has chosen a leader of the House Republicans who shares his commitment to the flawed theory that new budget-busting tax cuts for the wealthy, while placing greater burdens on the middle class and seniors, will somehow deliver a stronger economy. The architect of the radical Republican House budget, Ryan, like Romney, proposed an additional $250,000 tax cut for millionaires, and deep cuts in education from Head Start to college aid. His plan also would end Medicare as we know it by turning it into a voucher system, shifting thousands of dollars in health care costs to seniors. As a member of Congress, Ryan rubber-stamped the reckless Bush economic policies that exploded our deficit and crashed our economy. Now the Romney-Ryan ticket would take us back by repeating the same, catastrophic mistakes."</blockquote>

  • Michelle Malkin

  • Michael Moore

  • Brad Woodhouse

  • Rachel Maddow MSNBC

  • mike murphy

  • Michael Steele

  • Larry Sabato

  • davidfrum

  • Charles M. Blow

  • Robert Reich

  • Nilay Patel

  • Mark Harris

  • Progressive Change Campaign Committee

    The Progressive Change Campaign Committee issued the following statement: <blockquote>"Paul Ryan is a right-wing extremist who wants to end Medicare. This is a major unforced error by Mitt Romney. It gives President Obama and Democrats a chance to draw a clear contrast in 2012 by promising not to cut one penny from Medicare or Social Security benefits. If Democrats win in a landslide, this was the game changer." -- Adam Green, co-founder, Progressive Change Campaign Committee, a 1 million member grassroots organization</blockquote>

  • Laura Ingraham

  • John Kasich

  • Ari Fleischer

  • Susan B. Anthony List

    The national pro-life organization released the following statement: <blockquote>"By selecting Congressman Ryan as his vice presidential running mate, Governor Romney demonstrates his commitment to protecting American women and unborn children," said Marjorie Dannenfelser, president of SBA List. "A longtime pro-life advocate and a strong fiscal conservative, Congressman Ryan has insisted that there can be no 'truce' when it comes to advancing the rights of the unborn and achieving fiscal responsibility. He has a pristine pro-life voting record and will be an asset to Governor Romney's campaign. "Pro-life voters are a key demographic and help secure victory in critical elections," continued Dannenfelser. "The addition of a second strong pro-life leader to the ticket energizes the pro-life base - we are thrilled with this pick."</blockquote>

  • GOProud

    <blockquote>"The selection of Paul Ryan is a bold and inspired pick," said Jimmy LaSalvia, Executive Director of GOProud. "Paul Ryan has been the architect of policies that would benefit all Americans, especially gay Americans." "Paul Ryan is one of the few political leaders anywhere in the country willing to tell the American people the truth about the unprecedented budget crisis we are facing, and - more importantly - willing to put forward bold plans to put this country back on the road to fiscal solvency," continued LaSalvia.</blockquote>

  • Log Cabin Republicans

    <blockquote>"Congressman Paul Ryan is a strong choice for vice president, and his addition to the GOP ticket will help Republican candidates up and down the ballot," said R. Clarke Cooper, Log Cabin Republicans Executive Director. "As chairman of the House Budget Committee and author of the Republican "path to prosperity" that provided the blueprint for serious spending cuts in this Congress, nobody is more qualified to articulate a conservative economic vision to restore the American economy and stimulate job creation. </blockquote>

  • Sen. John Cornyn (R-Texas)

  • Jason Chaffetz

  • Center For American Progress President Neera Tanden

    <blockquote>"Just like Sen. John McCain's choice of Sarah Palin and George H.W. Bush's selection of Dan Quayle, Mitt Romney has been cowed by the right wing into choosing an extreme vice presidential nominee who will alienate moderate voters. It's now clearer than ever that as president, Mitt Romney would end Medicare as we know it, and will raise taxes on middle class families by more than $2,000in order to slash taxes on the wealthiest Americans. While there is a lot that can be said about Paul Ryan's extreme views, more important is what this choice says about Mitt Romney: that he is unwilling or unable to stand up to the far-right of his party and select a vice-presidential candidate that is both able to be president on day one and capable of governing by reaching across the aisle."</blockquote>

  • SEIU President Mary Kay Henry

    <blockquote>"If there were ever any doubt that Mitt Romney is not on the side of working people, today's choice of Rep. Paul Ryan as a running mate makes it crystal clear. With this choice, Romney has shown the American people that he believes Rep. Ryan's extremist, irresponsible and anti-worker agenda is what's right for our country. "Rep. Ryan has made a name for himself by fighting in the halls of Congress for tax giveaways for the wealthy and big corporations while proposing to gut vital services like Medicare and education, and eliminating any sense of retirement security for working families. His no-holds barred record of attacking seniors, children, and working men and women is frightening for the 99 percent of Americans who are not rich -- but for Mitt Romney it was a calling card to choose him as a running mate."

  • NARAL Pro-Choice America President Nancy Keenan

    <blockquote>"Mitt Romney's choice of Rep. Ryan as his running mate reminds us of why elections matter when it comes to our ability to make personal and private medical decisions," Keenan continued. "The outcome of the 2012 presidential election very well could determine whether abortion remains legal and accessible for the next generation of American women. Romney has pledged that taking away women's rights will be a priority for him and his choice of Ryan amplifies that promise to the extreme anti-choice backers of this ticket. My organization's priority is to make sure President Obama remains in the White House."</blockquote>

  • Kelly Ayotte

  • Herman Cain

  • Rick Perry

  • Tommy Thompson

  • Pete Hoekstra

  • Steve King

  • Eric Cantor

  • Dana Rohrabacher

  • Kenny Marchant

  • Gregg Harper

  • Rick Santorum

  • Rep. Kathy Hochul

    <blockquote>"Americans deserve new ideas for how we can reduce the debt and protect our seniors and the middle class. Just one year ago, Western New York voters rejected the Ryan-Collins policies that would end Medicare as we know it and hurt middle class families while giving more tax cuts to the rich. Our country needs to move forward, not re-hash failed ideas. Given Chris Collins' ongoing support for tax cuts for the rich that add nearly $1 trillion to the deficit and his willingness to send his business to China to line his pockets, it is clear my opponent is going to continue to pursue policies and priorities that have already been rejected."</blockquote>

  • Sen. Lisa Murkowski

  • Claire McCaskill

  • Jim DeMint

  • Chris Van Hollen

  • Rep. Mary Bono Mack

  • Sam Brownback

  • John Shimkus

  • Rep. Trent Franks

  • Frank Pallone

  • Michele Bachmann

  • Rob Zerban

    <blockquote>"Now that Paul Ryan's personal ambition has clearly trumped his interest in the First District, I have no doubt he'll find himself out of a job come November. Once Wisconsinites and voters across our country learn the truth about Ryan's radical plot to end Medicare as we know it, de-fund women's health care, and preserve tax breaks for millionaires, they'll vote against him not just once, but twice. In the coming weeks, our campaign will work with President Barack Obama and Vice President Joe Biden to continue getting the word out on Ryan's indefensible record, and building momentum to ensure victory on Election Day."</blockquote>

  • Scott Walker

    <blockquote>"Governor Mitt Romney made a bold and reform-minded selection in Congressman Paul Ryan of Wisconsin. This election has to be about who is going to look out for the next generation. America needs a comeback team to turn around the economy and to turn around the fiscal status of our country. Romney and Ryan have the ideas and the experience needed to take on these core issues. This is a great day for Wisconsin and an even greater day for America."</blockquote>