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

Photo by: Pablo Martinez Monsivais

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