Presidential Trash Talk

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U.S. President Barack Obama greets guests after delivering remarks during a World AIDS Day event at the Jack Morton Auditorium on the campus of George Washington University December 1, 2011 in Washington, DC. Focusing on "the beginning of the end of AIDS," the event was sponsored by HIV/AIDS awareness organizations The ONE Campaign and (RED). Speakers also included former Presidents George W. Bush and Bill Clinton (via satellite link), Sen. Marco Rubio (R-FL), Rep. Barbara Lee (R-CA), Tanzanian President Jakaya Mrisho Kikwete (via satellite from Tanzania), and music artists Bono and Alicia Keys. Photo: Chip Somodevilla/Getty Images

"Tell your boy to watch it. He might get his ass kicked." —President Obama to a friend of Marco Rubio, at a Miami hotel in February, according to the latest campaign e-book by Politico's Glenn Thrush.