Play of the Day -- Santorum endorses Romney, albeit tepidly
Conan O'Brien hits the former candidate on his backing of the presumptive nominee.
The late-night hosts could not ignore Rick Santorum's unenthusiastic, 11p.m. email endorsement of Mitt Romney for the presidency, and Conan O'Brien made sure that we all learned about the most pressing story in local news.
Today's Must See Moment -- Fast forward to 1:41 to see Letterman's pick for Romney's vice presidential nominee.