There's a candidate in this presidential race who remains a mystery — hazy, undefined, so full of contradictions that voters may see electing him as an enormous risk. I'm referring to the cipher known as John McCain. In fact, there are some basic things about McCain that apparently even McCain doesn't know. Asked Wednesday by reporters from Politico how many houses he and his wealthy wife Cindy own, McCain responded, "I think — I'll have my staff get to you." The correct answer seems to be somewhere between four and seven, but who's counting? I don't begrudge McCain his multiple...