HOW SHOULD DEMS HANDLE IRAN? As depressing as this is, it's never too early for liberals and Dem thinkers to start figuring out how to prevent Dems from dividing if Bush orders, say, limited strikes on Iran. Al Gore and Howard Dean might oppose them, as perhaps will the new and improved John Edwards. But what about other presidential contenders -- Mark Warner, Evan Bayh and Hillary Clinton? (Then there's always Joe Lieberman, who will probably volunteer to sit astride the first falling bomb, Dr. Strangelove style.)