Libertarian-leaning Republicans. Democrats are afraid of it because it's unregulated.
This.
Agree there. I think deomcrats COULD possibly support it, if it became more regulated. They love to be seen as "cooler" than Repubs, and Bitcoin is more of a cool and younger thing right now.
There's actually a lot more going on that I generalized into "afraid of it" with my terse comment. One of my Obama-supporting, Democrat, neo-liberal friends absolutely can't be convinced that there's anything wrong with the Federal Reserve system and banking cartel other than that money isn't issued directly by the government (her ideal, not mine). She thinks the TBTF bailouts were necessary. She absolutely can't be convinced that competition should be allowed in currency, even though she recognizes the dangers of monopolies in every other industry. She's afraid that if other currencies are allowed to prosper, one day she might walk into a store and not be able to pay for some goods. My best take on this ideology is a strong desire to preserve status-quo. It's ironically conservative. As long as her credit card works, she isn't willing to risk anything for the possibility of a better monetary system.