MADISON, Wis. (AP) — President Donald Trump and Joe Biden were locked in a tight race in Wisconsin as vote-counting stretched past midnight, and the nation's eyes turned to the same Midwestern battlegrounds that decided the election four years ago.

Trump and Biden were running close as counties around the state coped with a flood of absentee ballots prompted by the coronavirus pandemic. More than 1 million people resorted to mail-in voting, ensuring they could cast a ballot safely but raising the prospect that counting them all would take much longer than usual.

Congressional races were also on the ballot, and Democrats were intent on staving off a GOP supermajority in the Legislature that could strip the governor, Tony Evers, of any real veto power.

A look at key candidates, races, election mechanics and legal fights that shaped the campaign season:

PRESIDENT

Biden was hoping to reclaim the state from Trump after the president won it by less than 23,000 votes in 2016. Trump's victory marked the first time a Republican had captured the state since Ronald Reagan in 1984. Coupled with his wins in the other “blue wall” states of Michigan and Pennsylvania, Wisconsin propelled him to the White House.

Trump's narrow margin from four years ago gave Democrats hope they could flip the state for Biden, and they mounted an intense get out-the-vote effort, especially in liberal areas that did not turn out strongly in 2016. Polls consistently showed Biden leading Trump as Democrats bashed the president for his handling of the coronavirus pandemic.

They were locked in a close race as counting stretched from Tuesday night into early Wednesday. With nearly all votes counted, Biden had a lead of six-tenths of a percentage point over Trump, a margin narrow enough to allow Trump to request a recount if it stands.

CONGRESS

Democrat Ron Kind was in a close race to win a 13th term in his western Wisconsin seat against Republican Derrick Van Orden. Republican state Senate Majority Leader Scott Fitzgerald easily defeated Democrat Tom Palzewicz to win the southeastern Wisconsin seat vacated by Republican James Sensenbrenner's retirement.

Democratic Rep. Gwen Moore handily defeated Republican Tim Rogers to retain her seat representing Milwaukee and its suburbs. Republican incumbent Tom Tiffany defeated Democrat Tricia Zunker in northern Wisconsin's 7th District. Incumbents Mark Pocan, Bryan Steil, Glenn Grothman and Mike Gallagher all retained their seats. Pocan is a Democrat. Grothman, Steil and Gallagher are Republicans.

LEGISLATURE

Thanks largely to favorable district boundaries they drew, Republicans have had a stranglehold on the state Senate and Assembly for the last decade, and that seemed unlikely to change. They went into Election Day with an 18-13 edge in the Senate and a 63-34 advantage in the Assembly. Democrats' main goal was preventing Republicans from gaining a two-thirds majority in both houses. That would enable the GOP to override any veto from Democratic Gov. Tony Evers, allowing Republicans to advance their agenda at will. Democrats have handed nearly $2 million to their incumbents in a half-dozen swing districts in hopes of blunting the Republicans' attack. One of those incumbents, Sen. Patty Schachtner, lost her seat to Republican state Rep. Rob Stafsholt, but dozens of other races were still in play early Wednesday morning, and it was too early to tell if Democrats would be able to block the GOP push.

COURT CLASHES

The run-up to the election was marked by plenty of court battles as Democrats and Republicans struggled for advantage. Democrats and allied groups went to court and won a nearly weeklong extended counting period for absentee ballots postmarked by Election Day. But a federal appeals court handed Republicans a win by striking that down. Trump's persistent but baseless claims of fraud in mail-in voting led both sides to brace for potential legal challenges well beyond Election Day.

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