WASHINGTON (CNN) -- Veteran Pennsylvania Sen. Arlen Specter switched from the Republican to the Democratic Party on Tuesday, saying he has found himself increasingly "at odds with the Republican philosophy."
Sen. Arlen Specter was expected to face a tough re-election battle in 2010.
"This is a painful decision. I know I'm disappointing many of my colleagues," he said at a news conference announcing the move. "The disappointment runs in both directions.
"I'm putting principle at the top of the list," he added.
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Or re-election. Specter might have faced a popular right-wing Republican in a primary for the 2010 election, but now he will not be forced to do that.
As usual, he took heat from the dopey GOP: Republican National Committee Chairman Michael Steele ripped Specter, calling him a Republican in name only who was out of step with the rest of the party because of his "left-wing voting record."