It should be noted that something funky is going on with the polls. Cruz has been retailing in Iowa more than others the last week, yet his Iowa numbers have not reflected. The reality is that he has probably increased his caucus turnout significantly, but the polls don't show it. Also Cruz's national numbers have not suffered over the "eligibility" question, so it can't be said that there is a balancing (gains from retail, losses from the attacks). We've been seeing lots of polling inaccuracy the last couple cycles. I wonder why.