The difference is because in 2010 Obama was not on the ticket. You always get a completely different turnout model in off year elections. How do you not know this by now? Of course 2010 would look nothing like 2012.
Wisconsin is a Democrat leaning state and Obama is a very popular Democrat. Of course they turn out and vote for him.
Did you read my post? THIS ELECTION, the Republicans ADDED to both their state senate AND assembly majorities. In addition ALL our Republican congressmen were re-elected by wide margins. Only THREE of our EIGHT Congressional districts are controlled by Democrats. So even in a BIG TURNOUT year, in down ticket races, the Republicans won everything but the US Senate race. That is impossible for me to comprehend