Mourners create a memorial at the fountain of the Aurora Municipal Center after a prayer vigil Sunday for the 12 victims of Friday's mass shooting at the Century 16 movie theater. Kevork Djansezian/Getty Images hide caption

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Mitt Romney speaks at a campaign stop in Roxbury, Mass., on Thursday. Evan Vucci/AP hide caption

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GOP presidential candidate Mitt Romney speaks at a campaign rally in Bowling Green, Ohio, on Wednesday. J.D. Pooley/Getty Images hide caption

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President Obama clasps hands with Sen. Mark Warner (left), D-Va., and Democratic Senate candidate Tim Kaine during a campaign stop Friday in Virginia Beach, Va. Susan Walsh/AP hide caption

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President Obama speaks with House Speaker John Boehner during a meeting at the White House in 2011. A slowdown in job growth and a looming tax deadline could force the president to try to revive his "grand bargain" with Republicans. Jewel Samad/AFP/Getty Images hide caption

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Trader Peter Tuchman works on the floor of the New York Stock Exchange at the close of trading Friday. The stock market suffered its worst day of the year after a surprisingly weak jobs report. Richard Drew/AP hide caption

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President Obama greets diners at Reid's House Restaurant in Reidsville, N.C., last fall. While there, he talked to a college student about the importance of education — one of the ideas Obama comes back to often. Jewel Samad/AFP/Getty Images hide caption

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President Obama speaks with other G-8 leaders at Camp David in Maryland during the summit on Friday. Getty Images hide caption

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Barack Obama, then a Democratic candidate for a U.S. House seat, delivers his concession speech to supporters, while his wife, Michelle, tends to their daughter, Malia, on March 21, 2000, in Chicago. Frank Polich/AP hide caption

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President Obama speaks during a campaign rally at Ohio State University, Saturday in Columbus, Ohio. Haraz N. Ghanbari/AP hide caption

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A tax service company in Brooklyn, N.Y, on Tuesday, the filing deadline for federal taxes. Mary Altaffer/AP hide caption

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Dr. Jim Yong Kim is introduced as the new president of Dartmouth College in Hanover, N.H., in 2009. Jim Cole/AP hide caption

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Vice President Joe Biden poses with an uncooperative baby at a speech in Tallahassee, Fla., on Feb. 6. On Thursday, he's in Ohio to begin a series of speeches aimed at framing the presidential race. Phil Sears/AP hide caption

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President Obama speaks after touring Rolls-Royce Crosspointe engineering plant in Virginia on Friday. Obama declared America "will thrive again" after another encouraging report on jobs growth. Jewel Samad/AFP/Getty Images hide caption

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President Barack Obama speaks to students at Northern Virginia Community College in Annandale, Virginia, on February 13, 2012. Obama's campaign is ramping up efforts in Virginia in what is sure to be a battleground state in the general election. Jewel Samad /AFP/Getty Images hide caption

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