David Gergen actually said...
It does raise the specter that if he does not go that way, if he does not go for a pro-choice candidate, if he goes for a pro-life candidate, then, in effect, he will have allowed the Rush Limbaughs of the world to veto what he otherwise might have wanted to do.
Context
David Gergen discusses the implications of McCain's potential running mate choices on his campaign.
08/18/2008