Because Sarah Palin was a lunatic; she was not fit to govern the country; the fact that she was on the ticket said a lot about McCain, all bad. She reminds me of Trump in that regard. I am not a single issue voter. I think you can genuinely oppose abortion and vote Democrat. I support national health care (just like Trump and Sanders and Clinton!). I also support Obama on the environment. I vote for a candidate I believe to be the best qualified candidate in a particular race on a plurality of issues. I am an independent. I don’t regret voting for Obama in 2008; I do regret voting for him in 2012. (I did that because of Romney’s 47% comment, and Paul Ryan’s budget, also, frankly because Romney was a Mormon.)
I have not supported abortion personally for 20 years. And I don’t think Planned Parenthood does great things - and I think Trump is completely, openly lying about his position on this issue - and I think many of his supporters know this but don’t care, because, they too do not care about this issue enough to vote for a real prolife candidate. (he may personally be prolife but he has no intention of alienating his moderate East coast support, or large numbers of women across the country, women Trump desperately needs to win) In fact, many many Trumpers are prochoice, aka New York values. See Scott Brown, Giuliani. Planned Parenthood is terrified of Cruz, not Trump, for a reason. They are not stupid.