So what do you say to the fact that 65% of Americans think that Roe vs. Wade should be upheld?
Most Americans seem to think that without Roe v Wade all abortion would be illegal (which is o/c not the case).
Most Americans certainly do not support unrestricted abortion on demand; something that the Democratic party is associated with by a lot of people. Being thought of as NARAL's bitches isn't a great electoral selling point.
You should note that back in the early '80's the House Democratic leadership put a lot of effort into stopping abortion becoming a *major* issue.
California is more socially liberal than average and the proposition was apparently associated (at least in some way) with an unpopular governer etc.
Besides *notification* isn't the problem to a lot of people...
Religion in general (especially the sneering at deeply religious people). Association with counter-culture stuff in general (and yes, I know you asked for specifics. But specifics aren't the problem).
The best thing to do would to officially not even *have* a position of cultural issues...