Oprah Winfrey recently announced her support for Democratic presidential candidate Barack Obama. "Winfrey has never thrown her unrivaled power behind a candidate for president, and perhaps no presidential hopeful has been anointed by an arbiter with such reach," Scott Helman and Lisa Wangsness from The Boston Globe write.

However, the TV show host is not the first celebrity to endorse a presidential candidate. How well do you know your celebrity endorsements?