In 2010, Scott Walker won with 52.3% of the approximately 2.1 million turnout or 1,128,941 votes.
In 2014, Mary Burke got about the same total vote count (1,123,000), which would have been brought her with a win of around 52% in 2010 (and 2006 and 2002). And it would have been enough to win in 2014 if Wisconsin's turnout model had mirrored the national trend of lower turnout.
Of course, that didn't happen. Wisconsin's turnout increased by somewhere in the neighborhood of 300,000 voters-- with Walker taking the majority of these additional voters.
The current state of Wisconsin politics seems to be that there are about 1.3 million people that were galvanized during the recall in this state that will deliver for Scott Walker like the Post Service: Rain or shine, snow or sleet, we deliver our vote for Scott Walker.
The good news for Democrats is that about 1.6 million Wisconsinites voted for Obama in 2012 and while Scott Walker has been able to maintain a base enthusiasm that is unparalled in Wisconsin history, it has no place to go but down.