President Obama speaks at a campaign event at Loudoun County High School, Thursday, Aug. 2, 2012 in Leesburg, Va. (AP Photo/Pablo Martinez Monsivais)

Photo by: Pablo Martinez Monsivais

President Obama speaks at a campaign event at Loudoun County High School, Thursday, Aug. 2, 2012 in Leesburg, Va. (AP Photo/Pablo Martinez Monsivais)