This is a transparent shot across the bow of any primary challengers. Specter is basically saying, if you beat me in the primary, I will run as an independent in the general and either win or see to it that you dont win.
It is smart hardball politics on his part. It may well scare opponents out of the primary. I don’t like a lot of what Specter does, but he wont be the last incumbent to use the Lieberman example to hint to potential primary opponents that even if you can get the prarty nomination, it will be worthless to you.
See post 37