READY FOR A FIGHT By DON KAPLAN March 27, 2003 -- 'AMERICAN Idol" favorite, Lance Corp. Josh Gracin, is on 24-hour notice to be called up for active duty in the Iraq war. "Joshua has been very up front with us from the very beginning that he might have to leave us," Ken Warwick, a co-executive producer on "American Idol," told The Los Angeles Times. "He's in contact with his commander, and he might have to go. He's got a lot to lose." Gracin, 21, is among the nine finalists left on the popular reality-talent show. But he is also...