My sister runs a voters precinct in Madison in a very Democratic neighborhood. Of the 485 votes or so (approximate number), just 55 (exact) went to GOP candidates. Trump got 24; Cruz 22 and the remaining nine were split up among Kasich, Rubio, Carson, Paul, Christie etc. All the other votes in that precinct went Democratic. She’s been running this precinct for the past 30 years and said the very small percent of GOP votes in this case was typical. So at least in that precinct it doesn’t look like there were any crossover Dem votes for Cruz.
Actually, in the Lefty stronghold of Dane County, the Sanders-Clinton contest attracted 24,000 MORE Democrat votes than in the 2008 contest between Obama and Clinton:
Dane County, Wisconsin: 2016 Sanders 102585 Clinton 61072 total: 163657 2008 Obama 95416 Clinton 44187 total: 139603The commissariat wasn't going to bother with the Pubbie Mundane candidates. They left that chore to Milwaukee & Green Bay.