FILE - In this Jan. 3, 2008 file photo, then-Democratic presidential hopeful, Sen. Barack Obama, D-Ill., greets diners at a food court on caucus day, in Des Moines, Iowa. For President Barack Obama, it’s ending where it all began. Obama will close his 2012 campaign with a nighttime rally in Iowa, where his 2008 caucus victory jumpstarted his road to the White House. The president is expected to reflect back on the state’s pivotal role in his political rise during remarks delivered at the site of his first Iowa campaign headquarters. (AP Photo/M. Spencer Green, File)

Associated Press
FILE - In this Jan. 3, 2008 file photo, then-Democratic presidential hopeful, Sen. Barack Obama, D-Ill., greets diners at a food court on caucus day, in Des Moines, Iowa. For President Barack Obama, it’s ending where it all began. Obama will close his 2012 campaign with a nighttime rally in Iowa, where his 2008 caucus victory jumpstarted his road to the White House. The president is expected to reflect back on the state’s pivotal role in his political rise during remarks delivered at the site of his first Iowa campaign headquarters. (AP Photo/M. Spencer Green, File)
FILE - In this Jan. 3, 2008 file photo, then-Democratic presidential hopeful, Sen. Barack Obama, D-Ill., greets diners at a food court on caucus day, in Des Moines, Iowa. For President Barack Obama, it’s ending where it all began. Obama will close his 2012 campaign with a nighttime rally in Iowa, where his 2008 caucus victory jumpstarted his road to the White House. The president is expected to reflect back on the state’s pivotal role in his political rise during remarks delivered at the site of his first Iowa campaign headquarters. (AP Photo/M. Spencer Green, File)
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