A brand new poll was JUST released by Marquette Law School, and it shows two important things: First, that Ted Cruz is pulling out to a relatively comfortable lead over Donald Trump, and second, that Kasich's support is high enough to likely cause Cruz to lose delegates.
Via the inestimable Josh Jordan, who had this before Marquette even posted it on their website:
Latest MU Law poll in Wisconsin GOP primary (change from last):
Cruz 40 (+21)
Trump 30 (0)
Kasich 21 (+13)
Kasich will cost Cruz delegates.
— Josh Jordan (@NumbersMuncher) March 30, 2016
It looks like Cruz is going to walk away with the lion's share of the delegates from Wisconsin here, but likely due to Kasich he probably won't get the shutout, as the splitting of the vote means that Trump will probably win a couple congressional districts. Mind you, it isn't guaranteed at all that Kasich himself will get any; but he may throw some to Trump.