Play of the Day -- Surprises in Mitt Romney's tax return, Plus: Huntsman's got (Mitt's) back

David Letterman on Tuesday discovered an interesting fact about Mitt Romney's past while looking through his tax return: He really is the guy from underwear ads. It turns out that Romney "earned $5,000 in residuals from a 1984 photo shoot he did for a JCPenney circular." Don't miss today's Must See Moment at 1:45 when Jimmy Kimmel presents a revised Jon Huntsman ad that originally targeted Mitt Romney, but now endorses him: