When it comes to who the D.C. Republican Party should side with in the 2008 presidential contest, the choice is obvious — Mike Huckabee. Sure, the former governor of Arkansas doesn’t have much of a chance of winning, but he’s been consistent in his support of D.C. voting rights. In yesterday’s All-American Presidential Forum on PBS, hosted by Tavis Smiley, it was Huckabee who backed voting rights for the District’s 600,000 residents. In response to…