His previous opposition to Kagan once again draws into sharp relief just how abruptly he's transformed from a moderate Republican into one of the most liberal Democrats in the Senate. It comes just as his lead over his primary challenger Joe Sestak has evaporated--thanks in large part to Sestak's ad blitz blasting Specter's metamorphosis.
Specter's weathered a great deal of this since last Spring when he became a Democrat. He's reversed his previous positions on health care reform and other major issues. In some cases he's become an eloquent defender of positions he once opposed. But, at the very least, he's had months to let voters' memory of the oldArlen Specter fade.
With one week left before the primary--which is now a complete tossup--he's doubly damned. The nomination comes both too soon for him to hope it doesn't become an issue (in fact, Sestak's already made it one) and too soon for him to use confirmation hearings to grab the spotlight and demonstrate his newfound party loyalty.
Specter still has Obama's support...he just must be wishing Obama's timing had been better.