I used to think myself libertarian, but then I realized there was in fact a social contract, and that it's a mostly good thing for nearly every level of society.
After that I thought myself republican, until I realized that social issues were as important as economic ones.
Next I thought myself centrist, as good ideas can come from anywhere. And then I stopped hearing very many good ideas from very many places.
Then I thought myself democratic, until the national Overton window shifted so far to the right that the democrats couldn't see through both it and my personal Overton window.
Now I just wish the green party was at all viable. But then, nobody seems to know how to build an actual third party.
In the future I might find myself a complete socialist, if only as a reaction to how consistently more conservative the elephant and donkey get as they age.
Hey, there's a neat idea for a study: party platforms judged through the years on the political compass.