President Barack Obama greets supporters at a campaign rally for Missouri Senate hopeful Robin Carnahan, far left, Thursday, July 8, 2010, in Kansas City, Mo. (AP Photo/Pablo Martinez Monsivais)

Photo by: Pablo Martinez Monsivais

President Barack Obama greets supporters at a campaign rally for Missouri Senate hopeful Robin Carnahan, far left, Thursday, July 8, 2010, in Kansas City, Mo. (AP Photo/Pablo Martinez Monsivais)