Public Opinion Strategies, which has worked with Sen. Arlen Specter in his last three elections, has announced they will resign from his campaign team.

From the company's press release:

“Senator Specter has been a record-setting U.S. Senator, and we have been part of his campaign team in 1992, 1998, and 2004, but because of his surprising decision to switch parties today, we will no longer be involved,” said Glen Bolger, a Partner in the firm who worked on the ‘98 and ‘04 campaigns. “As Republicans, we are disappointed by Senator Specter’s decision.

h/t Ambinder