Apparently you haven't voted for a President, in your lifetime...If Sarah is going to bill herself as a pro-lifer (having a child with Down syndrome certainly puts her in that category because most would abort), then she has to be a pro-lifer 100% or it just doesn't mean a hill of beans anymore. You can't fight black with grey.
I don’t know that she is “billing” herself as anything. She’s an open book. She lives what she believes, however imperfectly, and its all there for you to judge and make your decision. She’s not hiding anything.
Did you vote for George W. Bush? He wasn’t completely pro-life, by your standards, either.