Some are… some aren’t. Yes, the tea party that emerged in the 2011 and 2012 elections was funded in large part to astroturf it into a republican tool… but they didn’t step into a vacuum to do this… there was already a large group of dissent there.
Whether or not they would have suceeded without the funding is a good question, but they were there. Ron Paul and his ilk was there LONG before Fox News and the Koch Brothers jumped into their territory.