Obama Takes On Both Romney and Santorum in Michigan TV Ad

A new player has entered the Michigan Republican primary battle -- President Barack Obama.

The Democrat incumbent is hitting the airwaves -- and the Republican presidential hopefuls -- in a new ad in Michigan. With Rick Santorum and Mitt Romney in a close battle heading into the Tuesday primary, Obama takes jabs at both of the Republican hopefuls -- but Romney draws a little more fire as the ad includes a quote from Romney reading let Detroit go bankrupt. Romney generally does better against Obama than Santorum in general election match-ups.

One other note on the Obama ad -- at the end of it, it reads Obama-Biden. It looks like one more reason for the buzz about Obama dumping Joe Biden to quiet down.