Nearly $81 million was spent on the failed effort to recall Gov. Scott Walker.
Government watchdog group the Wisconsin Democracy Campaign reported the figure in its analysis released Wednesday. The 15 recall races in 2011 and this year cost $137 million.
The money spent on Walker's race was more than double the previous record spending of $37.4 million in Walker's 2010 campaign.
Walker won the June 5 recall by 7 points over Democratic challenger Milwaukee Mayor Tom Barrett.
Last year nine state senators had recall elections and another four were on the ballot this year. Lt. Gov. Rebecca Kleefisch also faced a recall.
Of the 15 races, only three incumbent Republicans were tossed from office. That gave Democrats a slim 17-16 majority in the state Senate.