How support for Scott Walker grew between 2010 and 2012 — mapped.

Craig Gilbert at the Journal Sentinel displays this map...



... and says:

Walker's biggest gains over 2010 were in northern Wisconsin, in counties stretching from the Minnesota border across the state to Green Bay.

In other words, the governor's victory Tuesday wasn’t just a by-product of turning out his hardcore base in the southeastern Wisconsin suburbs. Those voters did turn out in droves. Ozaukee (73%), Waukesha (72%) and Washington (70%) had the highest turnout rates in the state, measured by the percentage of voting-age adults who went to the polls. Walker’s vote margin in Waukesha was almost as big as Barrett’s in Dane – a terrible sign for a Democrat, since Dane is bigger....

In other words, Democrats ended up dangerously over-reliant on the Milwaukee and Madison vote Tuesday. That vote materialized, but it couldn’t come close to compensating for Barrett’s weakness in much of rural and suburban outstate Wisconsin, especially when the GOP base was also turning out en masse.

I think this suggests something more general about the way Democrats work to build their majorities around the country.