DPC Barack Obama (22 images)

Senator Barack Obama (D-IL) speaks to a crowd on the steps of City Hall in Oakland, California on March 17, 2007. (UPI Photo/Aaron Kehoe).

Democratic presidential candidate Sen. Barack Obama, D-Ill., speaks at a fundraising concert in Los Angeles, California on December 10, 2007. (UPI Photo/ Phil McCarten)

Michelle Obama, Maria Shriver and Oprah Winfrey (L-R) stand together with Caroline Kenedy, rear, after they each spoke during a rally for Democratic presidential candidate U.S. Senator Barack Obama (D-IL) at UCLA's Pauley Pavilion in Los Angeles on February 3, 2008. Shriver, the wife of Republican governor Arnold Schwarzenegger endorsed Obama in the surprise appearance. (UPI Photo/Jim Ruymen)

Democratic Presidential candidate Sen. Barack Obama (D-IL) is pictured in the Punahou School yearbook in a 1979 childhood photo in Honolulu, Hawaii. Obama graduated from the Punahou School in 1979. (UPI Photo/Obama Press Office)