US Democratic presidential candidate and Senator Barack Obama (D-IL) greets supporters before speaking in Mitchell, South Dakota June 1, 2008. REUTERS/Rick Wilking
Democratic presidential hopeful, Sen. Barack Obama D-Ill., arrives for a rally at the Corn Palace in Mitchell, S.D. Sunday, June 1, 2008.
(AP Photo/Chris Carlson)
US Democratic presidential candidate and Senator Barack Obama (D-IL) arrives on stage to speak in Mitchell, South Dakota June 1, 2008. REUTERS/Rick Wilking
Democratic presidential hopeful, Sen. Barack Obama D-Ill., waves during a rally at the Corn Palace in Mitchell, S.D. Sunday, June 1, 2008. (AP Photo/Chris Carlson)
Democratic presidential hopeful, Sen. Barack Obama D-Ill., speaks during a rally at the Corn Palace in Mitchell, S.D. Sunday, June 1, 2008. (AP Photo/Chris Carlson)
Supporters cheer for Democratic presidential hopeful, Sen. Barack Obama D-Ill., during a rally at the Corn Palace in Mitchell, S.D. Sunday, June 1, 2008.
(AP Photo/Chris Carlson)
US Democratic presidential candidate and US Senator Barack Obama (D-IL) greets supporters after speaking in Mitchell, South Dakota June 1, 2008. REUTERS/Rick Wilking
Democratic presidential hopeful, Sen. Barack Obama D-Ill., catches a pancake on a plate during a gathering of veterans and military families in the armory at the W. H. Lyon Fairgrounds in Sioux Falls, S.D., Sunday, June 1, 2008.
(AP Photo/Chris Carlson)
Democratic presidential hopeful, Sen. Barack Obama D-Ill., reacts after catching a pancake on a plate during a gathering of veterans and military families in the armory at the W. H. Lyon Fairgrounds in Sioux Falls, S.D. Sunday, June 1, 2008.
(AP Photo/Chris Carlson)