An Obama champion, now in Romney's camp

Four years ago, Artur Davis was the first congressman outside Illinois to endorse Barack Obama. Shortly after Obama was inaugurated, Davis made a run to become Alabama’s first black governor but suffered what can only be called a life-altering defeat. Life-altering because Davis quit the Democratic Party last May and is now addressing crowds in favor of GOP nominee Mitt Romney. What made Davis—who embraced the moniker “Obama of Alabama”—denounce his party and join the other team?