The Democrats’ successful filibustering of the District Court and Appellate Court judges took place during the Judiciary Chairmanship of Sen. Hatch, not Specter. Maybe Hatch isn’t really a conservative either ?
“Don’t count your Hatches before the’re boobied” we used to say. I try not to go around and slap “not a conservative” on people, at least not Hatch. He was, however, ineffective and prone to folding like a cheap suit when the Democrats complained. Doesn’t speak one way or another about his conservatism.
Judging from the way you've forgotten that, I'd say it worked like a charm for some people.