President Barack Obama greets the crowd after arriving for a campaign stop at Loudoun County High School on Thursday, Aug. 2, 2012, in Leesburg, Va. (AP Photo/Evan Vucci)
President Obama greets the crowd after arriving for a campaign stop at Loudoun County High School on Thursday, Aug. 2, 2012, in Leesburg, Va. (AP Photo/Evan Vucci)
President Obama speaks at a campaign event at Loudoun County High School, Thursday, Aug. 2, 2012 in Leesburg, Va. (AP Photo/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)
