It is an election that the United States has followed with great interest because it was seen as an indication of whether a left-wing candidate could win in one of the United States' important "swing states", where the Democrats and Republicans are evenly matched.
Crowley, who is running to become Wisconsin's first black governor, presented himself as the candidate best placed to win in November against Republican Congressman Tom Tiffany, who is backed by President Donald Trump.
Hong ran on issues such as free childcare and healthcare, but was criticised for her previous support for defunding the police, which she later backed away from.
Leftist candidate wins in Minnesota
Several primary elections have been held in the United States overnight.
In Minnesota, Lieutenant Governor Peggy Flanagan defeated centrist Rep. Angie Craig in the Democratic primary for the Senate. This election was also marked by the struggle for power within the party between the left and centre factions of the Democrats.
Meanwhile, Lisa Demuth won the Republican primary for governor of Minnesota. Among the candidates she defeated was Trump-backed candidate Mike Lindell, the man behind the pillow company MyPillow. Demuth will face Democrat and Minnesota Senator Amy Klobuchar, who is also campaigning for the Democratic presidential nomination in 2020.
Wants to take his brother's place
Senator Darline Graham was forced into a runoff in the South Carolina Republican primary on Tuesday after Congressman Ralph Norman forced one. Darline Graham Nordone is the younger sister of the late South Carolina Senator Lindsey Graham. After Graham's sudden death in July, President Donald Trump urged the South Carolina governor to nominate her sister to the senatorial seat. She is seeking to take her older brother's place on the ballot in November's congressional election to serve a full six-year term in the Senate.
