The Sam Adams Alliance conducted a survey of some in the tea parties, and the results are at samadamsalliance.org/learn/activist-insights.aspx
The study suffers from a very small sample size, and whatever their methodology that means that the study is just for entertainment purposes only. However, it does show that fully 3/4 of respondents think immigration is "very important".
The problem, of...
... them was "was conceived by the Sam Adams Alliance". The latter group may have links to the Koch family. Looking for direct links between the "Kochtopus" or FreedomWorks and TPN is left as an exercise.
... group coincidentally named the “Sam Adams Alliance,” whose backers have until now been kept hidden from public. Cached google records that we discovered show that the Sam Adams Alliance took pains to scrub its deep links to the Koch family money as well as the fake-grassroots “tea party” protests going on today. All of these roads ultimately lead back to a more notorious rightwing advocacy group...