Artur Davis, former Democratic congressman of Alabama, backed Barack Obama in 2008 and even spoke at the party's convention. This year, Davis is a Republican and it was announced yesterday he will give a speech on stage at the GOP's own convention.
Speaking at a Tea Party gathering in Virginia earlier this week, Davis called himself a "converted sinner," according to the Washington Post.
[J]ust a few weeks after declaring himself a Republican, Davis has become an energetic and versatile spokesman for his new party. On Wednesday, speaking on Romney’s behalf in Ballston, he attacked Vice President Biden for his comment, to a largely black audience, that Republicans wanted to “put y’all back in chains.”
“Every African American in that audience knew who the ‘y’all’ was, and every African American in that audience knew what buttons he was trying to push by talking about ‘chains,’ ” Davis said, to a largely white audience.
See the RNC's announcement of Davis as a speaker here.