At the Liberty Live blog, Scott Dilley posts this C-Span video of Senator Arlen Specter (D-PA) appearing to change course on the issue of cloture on EFCA:

https://youtube.com/watch?v=F0SYSWOsTDI%26hl%3Den%26fs%3D1%26

Senator Specter has certainly seemed a good deal more erratic in his public pronouncements on the issue since his announcement that he was switching parties concluded:

My change in party affiliation does not mean that I will be a party-line voter any more for the Democrats that I have been for the Republicans. Unlike Senator Jeffords’ switch which changed party control, I will not be an automatic 60th vote for cloture. For example, my position on Employees [sic] Free Choice (Card Check) will not change.

Just last week, for example, at a Town Hall meeting, he told a vocal opponent of the bill that the secret ballot must remain a part of the process, that Senators were still addressing the issue of mandatory interest arbitration, and that ultimately "people will … have an opportunity to understand what the issue is."

Senator Specter seems to be equivocating a bit nowadays, perhaps due to an evolving position, or perceived electoral pressure on both flanks.  But it is also fair to note that throughout most of his early commentary on the bill, he always left open the likelihood that he would support some version of the bill:

The problems of the recession make this a particularly bad time to enact Employees Free Choice legislation. Employers understandably complain that adding a burden would result in further job losses. If efforts are unsuccessful to give Labor sufficient bargaining power through amendments to the NLRA, then I would be willing to reconsider Employees’ Free Choice legislation when the economy returns to normalcy.