Wisconsin has elected a new governor for a third term in 2020.
But the outcome of the state’s presidential race will be determined in November by the results of a new, closed primary election.
In the presidential race, the two leading candidates, Wisconsin Governor Scott Walker and Republican Donald Trump, will face off in the state for the first time in the race to succeed Democrat Hillary Clinton, who will become the first woman to win the White House.
On Sunday, Mr Trump announced his candidacy and the results came in in a close race.
“Wisconsin has never voted for a Republican presidential candidate,” the candidate said in a statement.
“I am running because I believe the American people deserve a president who will fight for them and not Washington, D.C.”
He was followed by Democratic candidate Jill Stein, who was the Green Party’s presidential nominee in 2016.
Mr Trump also made a campaign stop in Wisconsin on Sunday, where he said he would work to “make America great again” as president.
“I know Wisconsin and its people,” he said.
“They will be a strong, united force in the nation, because they have been so betrayed by Washington.”
The Wisconsin primary election will be the first for a Democrat since Mr Walker took office in 2011.
Mr Walker, a Republican, was re-elected by a record margin last year, but has been dogged by scandals that have tarnished his reputation in the US.
He has faced criticism from Democrats and independents for his handling of the budget and his controversial use of eminent domain to take land from Native American tribes.
But he has repeatedly said that he will remain in office, and he is set to hold another special election in March.
The race for governor is a race between Mr Walker, who is running for a second term, and Republican incumbent Scott Walker, the Republican governor of Wisconsin.
The winner of the race is expected to have a chance to become the next US president.
The US presidential election has been held since 1980, when George H W Bush defeated Ronald Reagan.
The outcome of Tuesday’s election could determine the fate of US relations with its main Asian rival, China, which has been critical of the US for decades.
On Tuesday, China’s foreign ministry said that it hoped the US “will stop its bullying and bullying behaviour in the Asia-Pacific region” and work towards the normalisation of ties.
“China is ready to work with the US in the region in the face of any interference, so as to strengthen the peace and stability of the region,” the ministry said in an emailed statement.