From Politico:
Faced with a high-profile defection and the prospect of political irrelevance in the Senate, Republicans took off the gloves Wednesday for a ferocious game of finger-pointing.
Republican Sens. Orrin Hatch and George Voinovich blamed the Club for Growth for imposing a right-wing litmus test that chased Arlen Specter out of the Republican Party. The Club for Growth blamed Specter — first for helping to ruin the GOP and then for leaving it. A leading Republican strategist blamed the party for turning its back on moderates. Sen. Lindsey Graham sniped at Republican National Committee Chairman Michael Steele. Specter’s pollster blamed the stimulus bill. Karl Rove blamed Specter himself.