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The initial figure was Baltimore Ravens linebacker Brendon Ayanbadejo, who has supported same-sex marriage for years.
Four years ago, estimates put African-American support nationally as high as 96 percent. But as the Democratic National Convention gears up in Charlotte, N.C., this week, the Obama campaign will have to work hard to limit a natural falling off of supporters in a race tied in national polling where every vote will count.
Tags: Barack Obama,