She will serve a 10-year term on the court.
The state's Republican governor, Scott Walker, grumpily tweeted: "Tonight's results show we are at risk of a #BlueWave in WI". Dallet's biggest gaffe so far was telling a San Francisco fund-raising event that Wisconsin needed to return to California "values". "Next, they'll target me and work to undo our bold reforms".
Elections Commission records show turnout in contested Supreme Court elections has ranged from a high of 34 percent in 2011 to a low of 18 percent in 2009.
"Last night was just a phenomenal night for all of us to see areas all over the state of Wisconsin turning blue", said Martha Laning, chair of the Democratic Party of Wisconsin.
With Democrats around the country fired up about this fall's midterm elections, Dallet was able to bring an unusual level of national attention to the Supreme Court race. Randy Bryce called the Dallet win "a rallying cry for working folks".
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Her win narrows the pro-Walker conservative majority on the court to 4 to 3 - and marks the first win by a liberal to an open seat since 1995. Cory Booker and former U.S. Attorney General Eric Holder all endorsed Dallet's candidacy.
Democrats, who had surprised Republicans in January by flipping a state Senate seat in rural northwest Wisconsin, quickly turned to the Supreme Court race. He camouflaged his own political leanings while accusing his opponent of being a judicial activist, then he waited for outside special interests to pour oodles of money into the race on his behalf. 2018 could be the year when his and his party's remarkable run of luck in Wisconsin just runs out.
Dallet has been a Milwaukee County circuit judge since 2008 and prior to that was a prosecutor for more than a decade.
As she greeted supporters and celebrated her win, Rebecca Dallet also talked about dynamics in the race for the state's highest court.
"The candidate with the most experience in our courts and standing up for the fairness of our courts won", Dallet said.
"I got a chocolate chip cookie for being the 1,000th voter", Heck says.
Before becoming a judge at the County Circuit Court, Dallet served as an assistant district attorney with the Milwaukee County District Attorney's Office and as an adjunct professor of law at Marquette University Law School. In 12 of those counties, she gained at least 1,000 more votes than did Screnock. Walker appointed Screnock a judge in 2015, and he was elected to a six-year term in 2016. Before that he was part of a team that defended Walker's Act 10 law that effectively ended collective bargaining for most public workers.