After posting this, I found this article by Mickey Kaus, at Slate, linked by Instapundit:
McCain Wobbles?Alito and Scalia vs. Breyer and Ginsburg
Updated Monday, June 16, 2008, at 5:20 AM ET
Suckers! Part XVIII*: John McCain met privately with some Clinton supporters in the diehard group Party Unity My Ass, and tried to wobble his way into their hearts:
...when deciding between a "more prolife" candidate and a less prolife candidate, what significance should a morally serious Catholic voter give to the credibility the "more prolife" candidate's promises? Just when does the morally serious Catholic voter get to say, "I don't believe you on prolife, anymore than I would if you said you were Napoleon IV."
"He stayed for a good almost half hour afterwards shaking hands, listening to our concerns, talking to us," said PUMA founder Will Bower, who said he thought many of the people there would vote for McCain.
Former Hewlett-Packard CEO Carly Fiorina stayed to mingle with the crowd, whose members also included Clinton backer Harriet Christian, made momentarily famous on YouTube for getting ejected from the Rules & Bylaws press area.
Bower said he'd liked McCain's answer on judges, in which he "pointed out that he supported Bill Clinton with both Ginsberg [sic] and Breyer." [E.A.]
...it's not permission to vote for Obama, but it seems to me a morally serious reason not to vote for McCain. Of course, others will decide the matter differently. But this business of the "you have to"...is already wearing thin--and it's June.
* Kaus has written a few posts about how McCain is already backing away from the promises that got him the nomination; this is the second that I've read.