Levi Johnston (L) walks with his girlfriend Bristol Palin after they arrived to attend the Republican National Convention in Minneapolis, Minnesota September 3, 2008. Bristol Palin is the daughter of U.S. Republican vice-presidential candidate and Gov. of Alaska, Sarah Palin. The campaign has announced that Bristol is five months pregnant and plans to marry Johnston. REUTERS/Brian Snyder (UNITED STATES) US PRESIDENTIAL ELECTION CAMPAIGN 2008 (USA)