Rep. Paul Ryan, the Republican vice presidential candidate, greets supporters during a campaign event at the Dallas County Courthouse in Adel, Iowa, on Wednesday, Sept. 5, 2012. (AP Photo/Mary Altaffer)

Photo by: Mary Altaffer

Rep. Paul Ryan, the Republican vice presidential candidate, greets supporters during a campaign event at the Dallas County Courthouse in Adel, Iowa, on Wednesday, Sept. 5, 2012. (AP Photo/Mary Altaffer)