With the midterm elections now less than a month away, the Democrats have been split into two camps on the issue of war and peace. The most dramatic split, surely, is the one between the House of Gephardt and the House of Gore. The rift is more glaring because, at least at first glance, each leader has had to reverse his stance on the Persian Gulf War to arrive at his present position. In endorsing a microscopically watered-down version of Bush Junior's original resolution, Dick Gephardt has said just that: He now believes his vote opposing the 1991 resolution authorizing Poppy Bush to go to war was a mistake.