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It is not uncommon for young folks to have liberal tendencies, when their brain fully develops and the can think logically and for themselves they turn conservative. The more development of their common sense, the more conservative they become. Alas, many folks live their whole lives with underdeveloped brains and very little common sense.

I have seen this with some of my friends, I thank the Good Lord for my blessings. I have always loved my sons as you have, but there were times I did not like them much. Fortunately, as they got older, we could talk without demanding agreement. I found that when we could talk about reasons instead of excuses that we actually agreed, but we had different approaches.
Continue to love him, but withdraw financial support for things that you cannot live with. I pray he will listen to God and do what is in his heart and not what man has duped him with.
Remember, thoughts and beliefs change throughout time, but he will be your son forever.

BTW, some of the best conservatives are those who have seen and lived the liberal side and realized that it is a path to destruction for the free man.