The TV Battle in Mich.: Santorum's True Conservative Vs. Romney's Native Son

Santorum makes the case that not only is he an authentic conservative but the most electable GOP candidate versus President Obama. Romney's ad, on the other hand, is more biographical, intended to reinforce his Michigan roots for voters. His ad, called "Growing Up," also aims at leveling Romney with average voters by showing him driving a car around what appears to be Detroit or its suburbs.