You answered you're own rhetorical questions. Bush handed Spector the Senate's Judicial Committee chairmanship. No doubt about it. Spector supporting Roberts and Alito was a foregone conclsuion. If you look back to Bork and Thomas, you'll see the REAL Arlen Spector. As a liberal Spector wasn't about to roll over on each and every issue that came his way. Example. Look at the Iraq deal today. Isn't Spector siding with the anti-Bush resolution in the Senate? I think so.
as I said below - had janice rogers brown been sent up, no way Spector would have been as agreeable.
Alito was vetted perfectly, and you can get pro-choice politicians to support those kind of judicial picks. that's my only point.