When the shooting starts March 24, 2003 BY ROBERT NOVAK SUN-TIMES COLUMNIST On the day after President Bush delivered his ultimatum, Patrick J. Buchanan stopped debating the war. The former presidential candidate and longtime adversary of the Bushes wrote that ''patriotism commands that when American soldiers face death in the battle, the American people unite behind them.'' On that very day, the country's foremost conservative publication listed Buchanan among ''leading figures in the anti-war movement [who] call themselves 'conservatives' '' but hate their country and want it to lose the war. To my astonishment, I was among them. David Frum,...