60Well, well, well. Arlen Specter switches parties, which along with the inevitable Al Franken victory in Minnesota gives Obama his filibuster-proof majority of 60. But I wouldn’t read too much into that: Specter is notoriously unreliable and self-serving, the Republicans’ Joe Lieberman, and along with Ben Nelson he will let the Dems down on lots of key votes. The real significance of his shift