If we compromise on life, that is a signal that there is nothing left that we are willing to stand up for. If both major party candidates were completely pro-abortion, I would find a third party that I could morally vote for without feeling complicit in murder. Pataki (anti-PP funding, pro-most pro-life initiatives) is right on the border of who I would be willing to vote for against a complete pro-abortionist like Hillary, Obama, or Bernie.
Not all Republicans are single-issue pro-life voters, man.