Republicans won single-party control in Alaska; Democratic victories in legislative and gubernatorial races restored two-party governance in New Hampshire, Wisconsin, Michigan and Kansas. Walker was a top target of Democrats and a polarizing figure in his state, sweeping into office during the tea party wave of 2010 and gaining national attention by leading a rollback of union rights that led to protests inside the state Capitol. But Democrat Christine Hallquist lost her bid to become the first openly transgender US governor in Vermont, where Republican incumbent Phil Scott won re-election.
In Colorado, Democrat Jared Polis became the first openly gay man to be elected governor of a USA state.
New Mexico also tipped into the Democratic column, as did ME, where Democratic Attorney General Janet Mills won the race to succeed combative Republican Gov. Paul LePage, who was term-limited after eight years in office. Kobach, the secretary of state in Kansas, in August defeated incumbent Gov. Jeff Colyer in the state's Republican primary.
Another Democrat trying to make history, Ben Jealous, lost his bid to become Maryland's first black governor to incumbent Republican Larry Hogan.
Democrat Laura Kelly waved to the crowd in Topeka on November 6, 2018, after she was elected governor of Kansas.
Polling had predicted the Democrats would take control of the House, and after flipping numerous Republican seats throughout the night, they were quickly declared victorious.
Republicans are favoured to retain control of the Senate, whose powers include confirming Trump's nominations to lifetime seats on the Supreme Court.
Whitmer's victory continues a trend of party changes in MI.
Republicans also scored a major victory in Ohio's governor race, where Mike DeWine, the state attorney general, defeated Democrat Richard Cordray, who served as the first director of the U.S. Consumer Financial Protection Bureau.
State legislative results were similarly mixed (as were congressional outcomes).
Voters in Colorado, Michigan and Missouri approved ballot measures Tuesday overhauling the redistricting process in ways that are meant to reduce the likelihood of partisan gerrymandering by either major party.
In addition to Wisconsin, Democrats also won governor races in three other states - Michigan, Pennsylvania and Kansas - that supported Trump in 2016, bolstering the party's hopes of capturing those states in the 2020 presidential election. The GOP held a trifecta of power in 25 states, compared with just eight for Democrats. With 36 governors races up for grabs this year, Democrats made gains. The Democratic victories in Kansas and MI will break up Republican trifectas.
Democratic candidates also triumphed in Illinois, Maine, New Mexico and Nevada, where Republicans had held the governorships.
As of mid-October, the Democratic Governors Association and its affiliated entities had raised $122 million during the past two years - a record outdone only by the Republican Governors Association's new high mark of at least $156 million.
Of the past 40 governors, 18 have been Democrats, but Democrats have only held the governor seat four years since 1991.
While Republicans have kept control of the Senate, as was expected, losing control of the House will make it more hard for President Trump to enact his agenda. Abrams, the former minority leader of the Georgia House of Representatives, in recent days sought to turn out black voters, with high-profile appearances in Georgia on her behalf by Oprah Winfrey and former President Barack Obama. And it will nearly certainly influence how states redraw congressional districts after the 2020 census.