In the comments at DailyKos, Mr. Savage posts a 9-point version of what he has to say about this, including:
8. Specter sent a whiny-ass letter to be read to the delegates, which was greeted with jeers.
(Warning: point 9 uses the F-bomb.)
Beats me why Senator Specter hasn't gotten on board with Employee Free Choice yet. Every day he waits hurts him.