Libertarian-leaning Republicans. Democrats are afraid of it because it's unregulated.
This.
I think liberals will also dislike bitcoin because it will force the government to be smaller and less powerful. The liberals generally want government to be as large as possible and for everyone to rely on it.
I agree. Generally democrats dislike it when people who work hard are able to climb the economic ladder and are able to create wealth for themselves. This is exactly the kind of people that would invest in bitcoin related businesses and would buy bitcoin both as an investment and to use as a currency.