When I was an evangelical, I considered it a lot more heavily than I do now, and for opposite reasons. At the time, I believed it would be morally wrong to vote for someone who was pro-choice.
I've turned almost 180 degrees since then, though.
These days, I don't think it would be wrong to vote for someone who is pro-life, but I do try to avoid it as much as possible. It's not a central issue for me, by far, and in itself it would not determine who I voted for (though it's quite the opposite for many of my still-evangelical friends, who see it as absolutely central to a candidate's integrity!).
I tend to vote Democrat anyway though, so I haven't come up any conflicts of interest yet. But if there were to be a Democrat candidate who was fervently pro-life, next to a Republican candidate who was pro-choice (even non-fervently), I would most likely vote for the Republican in that case. I have an inherent distrust of anyone who is politically fervent about being pro-life, basically. But the situation I present will most likely never happen, at least not in presidential elections... so I'll most likely go on my merry way, voting based on non-abortion criteria.