Who will be Romney's VP? The naming of his running mate is likely going to come in mid-August, after his foreign trip and the conclusion of the Olympics. Ken Rudin collection hide caption

itoggle caption Ken Rudin collection

Republican presidential candidate Rick Santorum addresses supporters at a campaign rally in Fond du Lac, Wis., on Sunday. Jae C. Hong/AP hide caption

itoggle caption Jae C. Hong/AP