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The Race Heats Up - After winning five primary contests this week, Mitt Romney says he’s ready to write a new chapter in the presidential race. President Obama, however, warns that it won’t be that simple as voters are unlikely to forget some of the “severely conservative” positions Romney has taken in the past to reach his goal of winning the nomination. —Joyce Jones(Photos from left: AP Photo/Carolyn Kaster, Chip Somodevilla/Getty Images)

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Mitt Romney - "The last few years have been the best that Barack Obama can do, but it's not the best America can do," Mitt Romney said in a victory speech this week after his five-state primary sweep. "Tonight is the beginning of the end of the disappointments of the Obama years, and it's the start of a new and better chapter that we will write together."(Photo: Jessica Kourkounis/Getty Images)

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Barack Obama - “I don't think that [the Republican] nominee is going to be able to suddenly say, ‘Everything I've said for the last six months, I didn't mean.’ I'm assuming that he meant it. When you're running for president, people are paying attention to what you're saying,” said President Obama in an interview with Rolling Stone magazine of the difficulty Romney will face trying to pivot from far right to the political middle.(Photo: Courtesy Rolling Stone)

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Jim Messina - “Welcome to the general election,” said Obama campaign manager Jim Messina in a Wednesday night conference call with reporters after Romney’s five-state sweep.(Photo: EPA/KAMIL KRZACZYNSKI /LANDOV)

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David Axelrod - "For the better part of last year, Romney has tried to tear down President Obama with a dishonest, negative campaign that even other Republicans have criticized,” said Senior Campaign Adviser David Axelrod during the conference call with reporters. “Well, the monologue is over. Now Romney has to put his record and his agenda up against the president’s, and we look forward to that debate."(Photo: Courtesy NBC)

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Andrea Saul - “Americans shouldn’t be surprised that President Obama’s campaign will attack Mitt Romney for his experience in creating jobs. Unfortunately, voters will have to expect that the Obama campaign will be running a campaign based on personal attacks to divert, distract and distort," said Andrea Saul, Romney's spokeswoman.(Photo: Courtesy Twitter)

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Tariq Trotter - "If Congress doesn’t act, it’s the students who pay. The Right and Left should join on this like Kim [Kardashian] and Kanye [West],” sang Tariq Trotter of the Roots, during Obama’s slow jam of the news calling for a freeze on Stafford loan interest rates during the president's appearance on Late Night with Jimmy Fallon.(Photo: Courtesy NBC)

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John Boehner - "This is the biggest job in the world, and I've never seen a president make it smaller," said House Speaker John Boehner at his weekly press conference while criticizing Obama for allegedly making the student loan interest rate debate a political issue and an excuse to travel to battleground states “on the taxpayers’ dime.”(Photo: AP Photo/Jacquelyn Martin)

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Marco Rubio - “I left the last page of my speech. Does anyone have my last page?” asked Sen. Marco Rubio (R-Florida) during a major foreign policy speech delivered at the Brookings Institute.(Photo: Brendan Hoffman/Getty Images)

Photo By Photo: Brendan Hoffman/Getty Images

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Newt Gingrich - “I think you have to at some point be honest with what’s happening in the real world, as opposed to what you’d like to have happened,” said Newt Gingrich, conceding that Romney has clinched the GOP presidential nomination. “I think obviously that I would be a better candidate, but the objective fact is the voters didn’t think that.”(Photo: AP Photo/The Star, Ben Earp)

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Jimmy Carter - "I would be comfortable” if Mitt Romney is elected president, said former President Jimmy Carter in an MSNBC interview.(Photo: Courtesy MSNBC)

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American Crossroads - “Four years ago, America elected the biggest celebrity in the world, and America got one cool president,” reads text in a new video ad from the conservative super PAC American Crossroads. “After four years of a celebrity president, is your life any better?”(Photo: www.americancrossroads.org)

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Allen West - “The American people want an economic future so bright that they will have to wear sunglasses,” said Rep. Allen West (R-Florida) in remarks delivered on the House Floor.(Photo: REUTERS/Jonathan Ernsta /Landov)