The same Arlen Specter who awaits his expected coronation as chairman of the Senate Judiciary Committee has a long record of betraying both his party and America's gun owners. To hear Specter talk, his fellow Republicans count on him. They do. Senate Republicans count on Arlen Specter to vote their way only until his vote is absolutely critical to the issue at hand. When he is most needed on the political battlefield, Arlen is either AWOL or preening in the enemy's tent about casting a difficult vote of conscience, to the applause of CBS, NBC, and the Washington Post. Proof?...