Politics / Barack Obama Obama Records Radio Ad for Georgia's Martin Black support key to Democrat's bid in Senate run-off By Matt Cantor, Newser Staff Posted Nov 21, 2008 8:48 AM CST Copied Sen. Saxby Chambliss, R-Ga., speaks during a rally in Atlanta, on Thursday, Nov. 13, 2008. Chambliss is in a tight runoff election with Democratic challenger Jim Martin for his seat in the Senate. (AP Photo/John Bazemore) Barack Obama is lending his voice to Georgia Democrat Jim Martin's Senate run-off race, Politico reports. In a 1-minute radio spot, the president-elect calls on listeners to “turn out one more time and help elect Jim Martin.” If Martin can win the support of the African-Americans who voted for Obama, he has a good shot at victory over GOP Sen. Saxby Chambliss. story continues below “Jim Martin’s a man of his word, and I know he’ll do everything he can in the Senate to help me change Washington and get America moving again,” Obama says in the ad. (Read more Barack Obama stories.)