Play of the Day -- Members bare it all in C-SPAN's body issue, Plus: Happy birthday, Bo Obama!

As the Obamas celebrate their dog Bo's third birthday this week, David Letterman points out some facts that you might not know about the first family's pet: Bo "has the lowest approval rating of any White House dog going into an election year," Letterman joked. "Do you know the difference between Obama's dog and the economy? ... Obama fixed the dog." Don't miss today's Must See Moment at 1:45 where C-SPAN, inspired by ESPN's body issue, presents its own: