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 course, is that the real leaders of the tea parties are on the other side.