The Club for Growth has been going pretty hard after former Governor, and current Senate candidate, Tommy Thompson. The Thompson campaign says that the Club is doing the bidding of former Rep. Mark Neumann, who may run against Thompson. (Some clubbers used to work for Neumann.)

One possible obstacle to a Club endorsement of Neumann over Thompson is trade. The Club favors free trade, but Neumann was one of the more protectionist Republicans during his time in Congress. The Cato Institute tracks congressional trade votes, and it shows that Neumann voted for trade barriers on five of five occasions he was given the opportunity to do so. (Note, incidentally, that in the previous link the Club relies on Cato work to ding Thompson.)

Perhaps Neumann has changed his views on trade over the years. If he runs, I trust the Club will ask him.