This has the potential of turning into a "Lieberman fiasco" for Specter if he doesn't play nice. And since we already know that is a given, this race is going to get heated up once grassroots Democrats take him on.
Earlier today on MSNBC, Rep. Joe Sestak (D-PA) reiterated his doubts about Sen. Arlen Specter's move into the Democratic party. But, at the end of his appearance, he almost explicitly threatened to run for the Senate if Specter didn't quickly prove a good steward of Democratic values.
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