But you discount that someone can become conservative over time. You don’t want any formerly liberal voters or politicians if I read your original post correctly. That is a pretty severe limit.
That is a good point. After all, isn't that pretty much what Ronald Reagan was?
And then you run the risk of having those who go in the other direction, start out good, but end up as whacked out lefties, like Goldwater unfortunately did (I still say it was that 20-something blonde he was with, however, influencing him).