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

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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.