I know a lot more people who oppose abortion and support other socially liberal policies like gay marriage than the other way around.
This. I suppose it's possible, and there was more of this in the past - think John Tower or Barry Goldwater - but there are few examples of it today. I'm across-the-board socially conservative and personally consider abortion the most important litmus test (followed by religious liberty), but I'm sure there are those who identify as such who disagree with me on those issues.
