President Barack Obama greets people upon arrival at Des Moines International Airport in Des Moines, Iowa, May 24, 2012.

President Barack Obama greets people upon arrival at Des Moines International Airport in Des Moines, Iowa, May 24, 2012.

President Barack Obama enters the backyard of Jeff and Sandy Clubb in Des Moines, Iowa for a discussion on the economy with neighborhood families, Sept. 29, 2010.

President Barack Obama enters the backyard of Jeff and Sandy Clubb in Des Moines, Iowa for a discussion on the economy with neighborhood families, Sept. 29, 2010.