There was some major redistricting in 2012. In Minnesota redistricting is handled by the Legislature and is based on population. http://ballotpedia.org/Redistricting_in_Minnesota . It's always a bit controversial but there hasn't been anything you could really call gerrymandering. Judges are initially appointed by the Governor but have to run for re-election on an ostensibly non-partisan basis, although they can get party endorsement. In the last election a real wingnut ran against an incumbent Supreme Court judge and was fortunately defeated. She was a real piece of work; she got the GOP endorsement at the convention despite her very dodgy history:
Lillehaug was challenged by West St. Paul attorney Michelle MacDonald, who founded the Family Innocence Nonprofit Project. MacDonald gained notoriety since winning the state Republican Partys endorsement last spring. Soon after, reports surfaced that she had been arrested for refusing to submit to a breath test and obstructing the legal process during an April 2013 traffic stop in which police suspected she was drunk.
She has wrangled with the party since then, including being barred from the partys booth at the Minnesota State Fair. A Dakota County jury convicted her in September.
http://www.startribune.com/politics/statelocal/281532611.html
In most regards the state government here is pretty clean. There are a few lunatics, of course...