Hovde and Neumann are pummeling each other. Missouri had a similar situation: it wasn't so much that Akin was "anti establishment" as it was that he was the last one standing. Also, Wisconsin has three - not just two - major "anti establishment" candidates so that helps Thompson squeeze out a win. Finally, judging by the last PPP sample, I expected Thompson to be clearly in third when you consider his nominal lead and the momentum that Neumann or Hovde supposedly have. This just shows that it's still a toss up.
Plus, I'm more willing to believe Marquette.