First, in terms of book sales, my publisher, my agent, and others in the conservative publishing community---names you would know---have experienced significant declines in sales since 2011. I thought it might just be my titles, but no, in contacting many of these people, their political/history titles are not doing well. A few have had very good success with novels, but not political novels. Their successes are in futuristic novels or "armageddon" type stories.
Second, in discussing appearances with my film at Tea Party groups around the country, I have found they are either defunct from just two years ago, have had membership fall dramatically, and so on. It doesn't seem to matter the region: I've had the same conversations with people in IL, ID, AR, OH, GA, and so on. One ID guy told me his chapter was simply defunct; one OH guy who led a big chapter said they can scarcely get 20 people out---with one big exception, when they do something on Common Core. When I spoke to them a couple of years ago, they had 100.
Several post-Obama groups that were created apart from, but related to the Tea Party, evaporated.
It is still possible to run a GOOD candidate against a RINO dinosaur, but the "Tea Party" label no longer turns out the voters, even GOP voters.
While my experience could be entirely anecdotal, the story of what the Dayton Tea Party did here locally, and how it screwed up and basically lost its power, is telling and I'll be happy to go over it in a private mail, but not a public thread.