In the Wisconsin Supreme Court election, the Democrats' preferred candidate, incumbent Ann Walsh Bradley, was reelected.

The Constitutional Amendment, however, favored by Republicans, was approved by voters and led to the removal of Chief Justice Shirley Abrahamson.

In the Spring primary, Republican Duey Stroebel defeated Tiffany Koehler and Lee E. Schlenvogt with 67% of the vote.

In the June 23, 2015, primary, Republican State Representative Chris Kapenga defeated Brian Dorow and M. D. Langner with 52% of the vote, and Democrat Sherryll Shaddock was unopposed.

The seat was vacated by Republican Chris Kapenga, who resigned after winning the special election for the 33rd State Senate district held in July 2015.

At the time of the election, the 99th Assembly district comprised part of western Waukesha County, including the city of Delafield and the villages of Dousman, Hartland, Merton, Nashotah, North Prairie, and Wales.

In the September 1, 2015, primary, Republican Cindi Duchow defeated Dave Westlake, Scott Owens, and perennial candidate Spencer Zimmerman, taking 40% of the vote.