How I wish I could have heard this in person! At a Tea Party rally in west Tennessee, Herman Cain creatively compensated for the temporary loss of his sound system — and, not surprisingly, the crowd loved it: Cain stands awkwardly for a few moments then suddenly begins to sing. Slowly at first but gaining in speed, he belts out “Impossible Dream” in the rich baritone he’s honed in church choir.“You know, when it’s your rally, you can do what you want to do!” Cain says as he finishes with a raucous laugh. The 500 or so supporters who have...