Barack Obama, U.S. senator for Illinois and democratic presi

UNITED STATES - NOVEMBER 29: Barack Obama, U.S. senator for Illinois and democratic presidential candidate, speaks during a fundraising event at the the Apollo Theater in New York, U.S., on Thursday, Nov. 29, 2007. The event marked Senator Obama's first trip to Harlem since he announced his plan to run for the presidency in February. CBS Corp. is among several film and television companies whose studio lots are being picketed by members of the Writers Guild of America. Candidates including Senators Hillary Clinton and Barack Obama have said they won't cross the picket lines. (Photo by Ramin Talaie/Bloomberg via Getty Images)