This PJ Media article about how some liberals become conservatives is pretty interesting and jibes with what I’ve heard from others, but speaking as a former Democrat I’d have to say that the process is not always that complex. In my case… like Ronald Reagan, I didn’t leave the Democrats; they left me. I will cop to becoming considerably more pro-life since then, but that’s mostly from having kids. Besides, it used to be that abortion wasn’t linked quite so securely to ideology.
Read the whole thing, though: it may give you some useful tips to help somebody else out who may be transitioning. Although I’ve found that the handiest trick there is pretty simple: if you’re in a mixed group of people and you know that a wavering liberal is in the crowd, don’t be the loudest a*shole in the room. The Angry Left are sometimes some of our best recruiters*.