Last summer, I wrote a column framed as a letter to a young Obama voter. It concluded: "You want policies that will enable you to choose your future. Obama backs policies that would let centralized authorities choose much of your future for you. Is this the hope and change you want?" It seems that some young Obama voters have decided it isn't. The Pew Research Center's poll of the millennial generation, which voted 66 percent to 32 percent for Obama, found that they now identify with Democrats over Republicans by only 54 to 40 percent. Perhaps they are coming to...