There are more issues in the world than abortion.
One of my online friends likes to joke that you could take a monkey, put a t-shirt on him that says “I (heart) Jesus” and put a sign in his hand that says “no abortions”, and the religious right would vote for him. Sometimes I wonder whether there might be a kernel of truth in that.
Abortion is one issue where both sides are deeply entrenched, unlikely to change their minds, and movement in the short term by either side is unlikely. In terms of actual effect, there’s not that much difference between voting for a an anti-abortion candidate who’ll be blocked by pro-choice representatives and voting for a pro-choice candidate who’ll be blocked by anti-abortion representatives. Meanwhile, there are countless other issues with moral ramifications where real change can take place. I think it makes perfect sense to take those other issues into account when deciding who to vote for, and making a candidate’s position on abortion, which is likely to be ineffective at producing change, whatever it is, secondary.