Sen. Arlen Specter (R-PA) told The Hill that he will not become a Democrat -- but he might become an independent.
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"I'm staying a Republican because I think I have a more important role to play there," he said. "I think the United States very desperately needs a two-party system. ... And I'm afraid that we're becoming a one-party system, with Republicans becoming just a regional party."
On the other hand, Specter left the door open to the idea of running as an independent, though he would continue to caucus as a Republican.