Rep. Leonard L. Boswell, Iowa Democrat (AP Photo/Charlie Neibergall, File)
President Obama works the crowd after speaking at the Alcoa Davenport Works aluminum factory in Bettendorf, Iowa, on Tuesday, June 28, 2011. (AP Photo/Charlie Neibergall)
Rep. Michele Bachmann, R-Minn., speaks during her formal announcement to seek the 2012 Republican presidential nomination. Bachmann will make stops in New Hampshire and South Carolina this week. (AP Photo/Charlie Neibergall)
Rep. Michele Bachmann, R-Minn., gets a hug from her husband Marcus following her formal announcement to seek the 2012 Republican presidential nomination, Monday, June 27, 2011, in Waterloo, Iowa. (AP Photo/Charlie Neibergall)
Former House Speaker Newt Gingrich, who is running for the 2012 Republican presidential nomination, speaks to local party activists in Waterloo, Iowa, on Thursday, May 19, 2011. (AP Photo/Charlie Neibergall)
U.S. Rep. Ron Paul, R-Texas, speaks during a news conference at his newly opened Iowa campaign office, Tuesday, May 10, 2011, in Ankeny, Iowa. (AP Photo/Charlie Neibergall)
Meat department manager Kevin Morlan arranges packages of pork at a Dahl's grocery store in Des Moines, Iowa, on March 3, 2011. (AP Photo/Charlie Neibergall)
Herb Magee looks on during the Naismith Memorial Basketball Hall of Fame class announcement, Monday, April 4, 2011, in Houston. (AP Photo/Charlie Neibergall)
Virginia head coach Shaka Smart reacts during the first half of a men's NCAA Final Four semifinal college basketball game against Virginia Commonwealth Saturday, April 2, 2011, in Houston. (AP Photo/Charlie Neibergall)
