On Saturday, the four Wisconsin Democrats vying for the party's gubernatorial nomination spoke at the Wisconsin Democratic Party's Founders Day dinner at the Milwaukee Athletic Club, stressing the need for unity to defeat Gov. Scott Walker (R) in the June recall election.

But perhaps the highlight was Rep. Gwen Moore (D-Wis.) unexpectedly bursting into song.

Moore had audience members singing and clapping to her song, "Hit the Road Scott," which she sang to the tune of "Hit the Road Jack." The other officials on stage joined in, singing, dancing and humming. The spunky performance, which rattled off a list of Walker's evils, lasted about six minutes.

Milwaukee Mayor Tom Barrett, former Dane County executive Kathleen Falk, Wisconsin Secretary of State Doug LaFollette and state Sen. Kathleen Vinehout (D-Alma) are running for the Democratic gubernatorial nomination. The primary election is on May 8 and the general election will be held June 5.

WATCH:

Below, the history behind the Walker recall effort:

Wave Election Sweeps In Conservatives
1  of  8
PLAY
FULLSCREEN
ZOOM
SHARE THIS SLIDE 
In 2010, a surge of Tea Party momentum and backlash against Democrats helped elect conservatives including Wisconsin Gov. Scott Walker, who became the state's first Republican governor since 2002.

Walker promised to cut taxes and create 250,000 new jobs, but a deeper look into his past also showed a politician who had inflamed tensions with unions before.

The Washington Post reports on his time as Milwaukee County Executive, during which the collective bargaining rights of unions already appeared to be one of his most ambitious targets:

During his eight-year tenure in Milwaukee County, Walker never raised property taxes. He cut the county workforce by 20 percent, improved its bond rating and gave back hundreds of thousands of dollars of his own salary as part of the effort to trim spending. But he also saw his relations with local unions deteriorate.

Union leaders say Walker never negotiated in good faith and had a singular solution to every budget problem: cut. Under his watch, the county privatized public jobs, laid off workers and placed others on furlough.

[...]

Walker argued that collective bargaining was the biggest hurdle to balancing the budget and that unions had little incentive to give ground because they almost always prevailed in arbitration. He said that the cuts he proposed were intended to prevent layoffs and accused union leaders of being uninterested in compromise.

Also on HuffPost: