When Arlen Specter became a Democrat nearly three weeks ago, everyone in Washington was extremely "surprised," but nobody was really all that surprised. Specter had been taking a beating from the right for, among other things, supporting the stimulus bill. He had lost the confidence of many in his party and, to ward off attackers, he was tacking steadily to the right to protect himself from a primary challenge he nonetheless seemed poised to lose.
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So he became a Democrat. The move made sense as a matter of both Senate and electoral politics. Specter fits in just as well among the significant ranks of conservative Senate Democrats as he does among the ever-shrinking ranks of moderate Republicans, and his move into the majority renews what had been his dwindling hopes of re-election.
But then, unthinkably, he doubled down on all of the positions he'd taken as a threatened Republican. He bucked his new party on health care, reiterated his freshly minted objection to the Employee Free Choice Act (a bill he once wholly endorsed), and he flatly opposed the nomination of Dawn Johnsen, who President Obama has nominated to head the Justice Department's Office of Legal Counsel.
Now, though, he's showing some signs of easing up on the Republicanisms.