Joe Biden Mocks Himself After Stephen Colbert Asks 'Are You Going Nuts?' (Video)

Democratic presidential hopeful Joe Biden had a pretty funny response when Stephen Colbert straight up asked him “are you going nuts?” during a discussion of Biden’s tendency to make embarrassing blunders when speaking — or rather, he had a pretty great response for Jimmy Kimmel. In a segment from tonight’s episode featuring Biden’s first late night appearance since announcing his run for president, “The Late Show” host ran down Biden’s recent string of gaffes. Among other thin...