Biden casts doubts on presidential run in emotional interview on "Late Night"


It's Stephen Colbert's first week as the host of Late Night, and early reviews are overwhelmingly positive, citing his brand of humor and intellect. Last night's show featured a candid, teary-eyed Joe Biden talking about his late son Beau, things his mom used to say and whether he has the fight left in him for a presidential run. Watch the two-part interview below.