He 's fallen back to earth since then , though , surviving accusations this summer of illegal campaign coordination but facing a much tougher than expected challenge from Burke , a Wisconsin school board member who is also a former Trek Bicycle Corp. executive and state secretary of commerce . Wisconsin Republican Sen . Scott Walker won re - election Tuesday , CNN projects . He defeated Democrat Mary Burke , a businesswoman and member of the Madison school board . Walker is now positioned for a potential 2016 run for the GOP presidential nomination .
Wisconsin Republican Sen . Scott Walker won re - election Tuesday , CNN projects . He defeated Democrat Mary Burke , a businesswoman and member of the Madison school board . Walker is now positioned for a potential 2016 run for the GOP presidential nomination .