"Some historians have reason to believe people don't really understand the genealogy of past U.S. Presidents. Research shows at least five U.S. presidents had black ancestors and Thomas Jefferson, the nation's third president, was considered the first black president, according to historian Leroy Vaughn, author of Black People and Their Place in World History.
Vaughn's research shows Jefferson was not the only former black U.S. president. Who were the others? Andrew Jackson, Abraham Lincoln, Warren Harding and Calvin Coolidge. But why was this unknown? How were they elected president? All five of these presidents never acknowledged their black ancestry."
http://www.diversityinc.com/public/1461.cfm
i don't know why people are making a big deal about it Obama is just as white as he is black lol