Watching presidential politics lately, I've been thinking back to when I was 13 years old and had my heart broken for the first time. It was 1972, and I was antiwar and infatuated with Senator George McGovern. But as I handed out McGovern leaflets in Yamhill County, Ore., I was greeted as if I were the Antichrist. Soon afterward, Mr. McGovern was defeated in a landslide. As Howard Dean will probably be, if the Democrats nominate him. It is, of course, the Democrats' privilege to stand on principle, embrace the man they admire most and leap off a cliff together....