If he doesn't support pro-life 2008 candidates, what business is it of the pro-life movement? If it's true that he himself is pro-life, then that's good and that's one more vote for pro-life legislations. Again, assuming he's TRULY pro-life and not putting on this dog and pony show. Keep in mind that Casey is a Democrat and will probably vote with the Rats Once again, the pro-life movement is shooting themselves in the foot with their narrow thinking.
That's the most important issue here. How Bob Casey votes himself. The rest is window dressing. I can assure you that there will never be a single person in this country who walks into a voting booth and says "Hmmm, who should I vote for? Let's see... Bob Casey endorsed candidate X, who is from the same party as him... That's good enough for me. I'll go with candidate X."
What Bob Casey (or anybody else in politics) votes for or against is what matters. Not who they vote for. not what they say. From what I know right now, I'd probably rather have Bob Casey picking my next Supreme Court justice than Rudy Giuliani.