That has been my experience. Put enough folks together with their own "single issue preference" and you end up with millions of votes lost over a dozen different "single issues"
Some folks may be (for your specific area) pro-life, but they don't say it strongly enough and use it as a main part of their platform and many will still pass on that candidate for "being wishy-washy/weak/etc." even if it means that a abortion-mill, "kill them all" piece of Evil like Obama gets another chance to help insure millions more are killed. I can understand the concept of being fussy with one's votes, but have a bit of a problem when the difference of choices is crystal clear and the choice that results in the most evil is the one taken.
But I digress - different season and different candidates. None of our main choices are pro-abortion.
My point was simply that those who accuse others of being single-issue voters (I don't mean you) are usually just saying so because THEIR single issue isn't the one being neglected by the establishment Republican candidate.