WOW collar counties less enamored of Trump than Romney

And in 2008, John McCain did better than Trump in Waukesha and Ozaukee counties.

Source:  CNN (2008, 2012, 2016)

Shifting gears here, let's take a look at the Wisconsin counties where Democrats experienced the biggest percentage loss of votes, comparing the 2012 and 2016 Presidential elections.

Source:  Milwaukee Journal Sentinel

The FiveThirtyEight provides an explanation.

Which appears to be confirmed by this bar graph.

Source:  U.S. Census Bureau QuickFacts

Mapping the most considerable Democratic vote loss.