Democratic presidential hopeful, Sen. Barack Obama, D-Ill., speaks to members of the United Auto Workers Region 4 Conference during a stop at the Grand River Center in Dubuque, Iowa, Tuesday, Nov. 13, 2007. (AP Photo/Mark Hirsch)
Democratic presidential hopeful, Sen. Barack Obama, D-Ill., speaks to members of the United Auto Workers Region 4 Conference during a stop at the Grand River Center in Dubuque, Iowa, Tuesday, November 13, 2007. Obama said Tuesday that rival candidate Sen. Hillary Rodham Clinton's doubts about big foreign trade deals came only in the heat of the U.S. presidential campaign. (AP Photo/Mark Hirsch)
Democratic Presidential hopeful Sen. Barack Obama, D-Ill., left, greets Marge Jindrich, of Genoa, Ill., following a speech to the United Auto Workers Region 4 Conference at the Grand River Center in Dubuque, Iowa, Tuesday, November 13, 2007. (AP Photo/Mark Hirsch)
Democratic Presidential hopeful Sen. Barack Obama, D-Ill., left, gives Barbel Fernandez of Chicago a kiss on the cheek while greeting her following a speech to the United Auto Workers Region 4 Conference at the Grand River Center in Dubuque, Iowa, Tuesday, November 13, 2007. (AP Photo/Mark Hirsch)