Tampa

Artur Davis, a former Democratic congressman from Alabama, has been a Republican for only a few months. But his speech tonight at the Republican convention is important because he reflects a major theme of Mitt Romney’s campaign against President Obama and another theme promoted by the GOP.

The Romney theme is that it’s okay to have changed your mind about Obama. Davis, an African American and a political moderate, seconded the nomination of Obama at the Democratic convention in Denver in 2008. But he’s been disappointed in the Obama presidency and today supports Romney.