They would say that of course, even if it were not true -- to admit they didn't know about it would be a pretty big blow to their credibility. Maybe true though.
As-is, still a blow to McCain's judgment though I think, as I have to agree with Cycloptichorn that it will have an affect -- maybe not huge, but not nothing either. Palin will be judged for her parenting skills in raising a daughter who gets pregnant at 17, out of wedlock, by exactly the people who are supposed to be most jazzed by the pick. (Again, in case it needs clarification, I am here speculating what evangelicals might think, not broadcasting my own opinion. I don't care about it in and of itself.)
This is sure a roller-coaster. Interested in getting a more complete picture from polls in the next week or two.