1. His support of abortion.
2. He has made clear that he will block any judge that believes in strict construction.
3. Trial lawyers like him, Chuck Schumer likes him, and the mainstream media LOVES him.
4. He voted against Robert Bork.
5. He also has voted wrong on taxes, defense, pork barrel spending, school choice, tort reform and parental notification, to name just a few.
6. He secured the release of murderer Ira Einhorn, who fled to France.
7. He is a backstabbing RINO, therefore can't be trusted.
8. We need a strong object lesson to other RINOs, who are learning disabled.
http://stopspecter.savethegop.com/
http://notspecter.com/
You forgot that Soros backed him.
When Specter gets the opportunity, he will take the lead in shooting down appointees. He promised the Pittsburg-Gazette he would. Perhaps, he promised Bush and Rove, he wouldn't. That means you can't trust his word. By his deeds he's a rat.
Regarding Santorum, he should probably distance himself a little more from Specter.