Republican presidential candidate Mitt Romney shakes hands with Sen. Marco Rubio, R-Fla., during a town hall-style meeting in Aston, Pa., on Monday. Jae C. Hong/AP hide caption

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Mitt Romney speaks at the 138th National Rifle Association of America meetings on May 15, 2009, in Phoenix. Christian Petersen/Getty Images hide caption

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President Obama has a chance to make fun of his opponents — and himself — when he addresses the annual White House Correspondents' Association gala later this month. Last year he joked about Donald Trump and the "birther" issue. Martin H. Simon-Pool/Getty Images hide caption

itoggle caption Martin H. Simon-Pool/Getty Images

Supporters of the health care law have recently embraced the term "Obamacare," a word they once recoiled from. Charles Dharapak/AP hide caption

itoggle caption Charles Dharapak/AP