Swarmed by autograph seekers and admirers, actor Charlton Heston easily won a National Rifle Assn. board election, a key test for the gun lobby's embattled leadership. Heston, 72, worked the aisles like a veteran politician as voting began at a tumultuous membership meeting on the second day of the NRA's annual convention. Dozens sought his signature, questioned him about his movie roles, showed off their babies and posed for pictures beside him. Heston received 1,038 out of 1,410 ballots cast--about 74% of the vote.