Joe Biden
His verbal flubs and foibles can make him a punch line for Republican critics and occasionally even irk his own boss, such as when he boxed in Barack Obama by expressing support for gay marriage last spring. But Joe Biden's selection as Vice President has proved to be one of Obama's best decisions. Deployed as an emissary to Capitol Hill during snarled debt-limit negotiations in 2011, Biden was an effective attack dog on the campaign trail this year. The Scranton, Pa., native stumped tirelessly, wooing Rust Belt Catholics and besting his GOP counterpart Paul Ryan in their lone debate. The spirited performance positions Biden — who ran for President in 1988 and 2008 — to make a third run at the top job four years from now. When a reporter asked on Election Day whether it was the last chance Biden, 70, would get to vote for himself, the Veep grinned and said, "No, I don't think so."