Arlen Specter (D-Pa.-cum-R-Pa.-cum-D-Pa.), a.k.a. "Snarlin' Arlen," a.k.a. "Specter the Defector," is one of the most unloved people in politics. He is ornery, vain, disloyal and a brazen opportunist. He lacks a discernible ideology, puts his finger to the political winds before casting a vote and in the end does what is good for Arlen Specter. I will miss him. I will miss him because, whatever his faults, he fought the forces of party unity and ideological purity that are pulling the country apart. "Let me tell you," he complained in 2005, before both parties disowned him, "it's heresy -- I...