As everyone seems to understand, the fact that Specter now calls himself a Democrat will change the calculus in the Senatea, but only on the margin. People like Specter, Ben Nelson, Evan Bayh, Olympia Snowe, and Susan Collins hold the balance of power in the Senate, when they choose to exercise it. The fact that Specter now has a (D) next to his name instead of an (R) won't really change that. While Specter has already announced he will not re-flip-flop on EFCA, his quasi-pro-choice votes will hopefully drift a bit to the left, since he will no longer have any pressure from a primary opponent.
Deep thought: does this mean John Cornyn will feel more pressure to light even more money on fire?