Wisconsin Gov. Scott Walker (R) warned Republicans to "wake up" after Democrats flipped a state Senate seat in a GOP-leaning district.

"Senate District 10 special election win by a Democrat is a wake up call for Republicans in Wisconsin," Walker tweeted.

"WAKE UP CALL: Can’t presume that voters know we are getting positive things done in Wisconsin. Help us share the good news."

Senate District 10 special election win by a Democrat is a wake up call for Republicans in Wisconsin. — Scott Walker (@ScottWalker) January 17, 2018

WAKE UP CALL: Can’t presume that voters know we are getting positive things done in Wisconsin. Help us share the good news. — Scott Walker (@ScottWalker) January 17, 2018

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Walker also warned that the GOP can't "presume voters know that more people are working than ever before" or that "we invested more actual dollars into schools than ever before."

He urged people on Twitter to "help us share the good news."

The warnings come after Patty Schachtner (D) defeated state Rep. Adam Jarchow (R) in a special election to replace a state senator who left for a job in Walker's administration.

Schachtner won in the state's 10th Senate District, which had voted heavily for President Trump Donald John TrumpObama calls on Senate not to fill Ginsburg's vacancy until after election Planned Parenthood: 'The fate of our rights' depends on Ginsburg replacement Progressive group to spend M in ad campaign on Supreme Court vacancy MORE in the 2016 presidential election.

Democrats still remain in the minority in the state Senate, but party members have expressed optimism heading into November's midterm elections in the wake of successful campaigns at a state and local level.