President Barack Obama speaks at a campaign grassroots event at the Iowa state fairgrounds, in Des Moines, Iowa, Thursday, May 24, 2012. (AP Photo/Nati Harnik)

Associated Press
President Barack Obama speaks at a campaign grassroots event at the Iowa state fairgrounds, in Des Moines, Iowa, Thursday, May 24, 2012. (AP Photo/Nati Harnik)
President Barack Obama speaks at a campaign grassroots event at the Iowa state fairgrounds, in Des Moines, Iowa, Thursday, May 24, 2012. (AP Photo/Nati Harnik)
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