If Specter loses the primary, hopefully he'll pull a Lieberman and win as an Independent (Pennsylvania for Specter )
In such a scenario it would most likely result in a Democrat victory. But the good news is would no longer would have Specter's RINO ass around to vote with the DEMs.
Yes, instead of a moderate Republican, you'll have a Democrat, which will no doubt be much more palatable to you.
After all, a Republican who's with you 75% of the time is no where near as useful as a Democrat who's with you 10% of the time.
Good luck with all that.