The exodus of white Democrats to the GOP in southern state legislatures this year is the last chapter of a very old story about realignment, one that -- in this homogenous media age -- has finally come to the most local levels of politics. This, in Georgia, is something different -- and striking to insider because one of the switchers, Ashley Bell, is a former president of the College Democrats seen not that long ago as a Democratic rising star: Two African-American Democrats on Thursday announced that they were joining the Republican Party. Hall County Commissioner Ashley Bell and former...