"On this state of the record, I am unwilling to have my twenty-nine year Senate record judged by the Pennsylvania Republican primary electorate.”

Those old windbags in the Senate still now how to surprise you.

Specter To Switch Parties - New York Times Caucus Blog

“Since my election in 1980, as part of the Reagan Big Tent, the Republican Party has moved far to the right. Last year, more than 200,000 Republicans in Pennsylvania changed their registration to become Democrats,” Mr. Specter said in a statement released in the early afternoon. “I now find my political philosophy more in line with Democrats than Republicans.”

He said he has experienced a change of heart since the response to his vote for the stimulus legislation.

“Since then, I have traveled the State, talked to Republican leaders and office-holders and my supporters and I have carefully examined public opinion,” his statement said. “It has become clear to me that the stimulus vote caused a schism which makes our differences irreconcilable. On this state of the record, I am unwilling to have my twenty-nine year Senate record judged by the Pennsylvania Republican primary electorate.”

...Senator Olympia Snowe of Maine, who also supported the Obama administration’s economic stimulus legislation, said Mr. Specter’s decision reflected the increasingly inhospitable climate in the Republican party for moderates.

“On the national level of the Republican Party, we haven’t certainly heard warm, encouraging words about how they view moderates, either you are with us or against us,” Ms. Snowe said. She said national Republican leaders were not grasping that “political diversity makes a party stronger and ultimately we are heading to having the smallest political tent in history for any political party the way things are unfolding.”

Two Moderate Republican Senators open up over at Politico

"I don't want to be a member of the Club for Growth,” said Graham. “I want to be a member of a vibrant national Republican party that can attract people from all corners of the country — and we can govern the country from a center-right perspective.”

“As Republicans, we got a problem,” he said.