Is Senator Arlen Specter changing his position on cloture for card check?

The Workforce Fairness Institute has a new ad out about Senator Specter's changing his position on voting for cloture on card check. You can check it out by clicking here.

On March 24th of this year, NBC's First Read reported that "Sen. Arlen Specter (R) signaled today that he would vote against cloture on the measure, denying Democrats 60 votes to break a GOP filibuster on the legislation -- even if Al Franken gives Democrats a 59th vote."

Since then, Senator Specter has switched political parties and become a Democrat. With a tough primary battle ahead of him, is Specter slowly changing his tune about card check legislation to gain the support of liberals in the state? It sure seems like it.