US primary elections: which states to watch as Biden seeks boost amid Trump's trouble

Democrats hope for big wins as Republicans scramble to spin a new message after FBI raids former president's Florida resort

Suffield, Connecticut, is one of several small towns in the state where control flipped from Democrats to Republicans in last year’s municipal races. AP

A voter arrives at Suffield Middle School in Connecticut on primary election day. AP

Republican first selectman Colin Moll talks to Suffield residents Richard and Connie Davis before they vote in the state's primary election on Tuesday. AP

Jennifer Carnahan is running for the Minnesota US House seat vacated by the death of her husband Jim Hagedorn. Star Tribune / AP

Representative Ilhan Omar celebrates with her children after winning the Democratic primary in Minnesota's Fifth Congressional District. Star Tribune / AP

An election judge shows people how the voting machine will operate and detect errors on ballots on election day at a polling centre in Burnsville, Minnesota. AP

Rebecca Kleefisch, Tim Michels and Timothy Ramthun participate in a televised Wisconsin Republican gubernatorial debate in Milwaukee. Tuesday's winner will advance to face Democratic governor Tony Evers in November. AP

Joel Kleefisch and his daughter Ella listen as his wife Rebecca addresses a campaign event in Madison, Wisconsin. Getty Images / AFP

Wisconsin lieutenant governor Mandela Barnes is running to become the Democratic nominee for the US senate and would face incumbent senator Ron Johnson in the general election in November. Getty Images / AFP

Mr Barnes would be the first black senator to represent Wisconsin. Getty Images / AFP

Vermont senator Becca Balint is seeking the Democratic nomination to run for the state's vacant US House seat. AP

Democratic US House candidate lieutenant governor Molly Gray speaks to voters in Middlesex, Vermont. AP

John Gurney, of Brattleboro, casts an early ballot for Tuesday's Vermont primary election. The Brattleboro Reformer / AP

US Congressman Peter Welch, a Democrat, is running for the open US Senate seat in Vermont. The Brattleboro Reformer / AP

Sianay Chase Clifford, a Vermont social worker, is one of four women seeking a seat in the US House for Vermont. AP

Today's US primaries come just hours after former US President Donald Trump reported that the FBI raided his Florida home, which has some Republican strategists scrambling — especially those with a Trump endorsement. Tonight's election results could be a clear indication of the former president's hold.

Here's what to watch

The Republican tussle in the Wisconsin governor’s race on Tuesday features competing candidates endorsed by former president Donald Trump and his estranged vice president, Mike Pence.

Meanwhile, voters in Vermont are choosing a replacement for Patrick Leahy as the US Senate's longest-serving member retires. In Minnesota, US Representative Ilhan Omar faces a Democratic primary challenger who helped defeat a voter referendum to replace the Minneapolis Police Department with a new Department of Public Safety.

Wisconsin

Construction company co-owner Tim Michels has Mr Trump’s endorsement in the governor’s race and has been spending millions of his own money, touting both the former president’s backing and his years working to build his family’s business into Wisconsin’s largest construction company.

Establishment Republicans including Mr Pence and former governor Scott Walker have endorsed Rebecca Kleefisch, who along with Mr Walker survived a 2012 recall effort.

With Senate control at stake, Democrats also have tough choices. Democratic support coalesced around Lt Governor Mandela Barnes late in the race, when his three top rivals dropped out and threw their support to him. He would become the state’s first black senator if elected.

Minnesota

Democratic Governor Tim Walz faces a little-known opponent as he seeks a second term. His likely challenger is Republican Scott Jensen, a physician and former state legislator who has made vaccine scepticism a centrepiece of his campaign and faces token opposition.

Crime has emerged as the biggest issue in Ms Omar’s Democratic primary. She faces a challenge from former Minneapolis City Council member Don Samuels, who opposes the movement to defund the police and last year helped defeat efforts to replace the city’s police department. Ms Omar, who supported the referendum, has a substantial money advantage and is expected to benefit from a strong grass roots operation.

Connecticut

It has been roughly three decades since Connecticut had a Republican in the US Senate, but the party isn’t giving up.

In the Republican primary to take on Democratic Senator Richard Blumenthal, the party has endorsed former state House Minority Leader Themis Klarides. She is a social moderate who supports abortion rights and certain gun control measures and says she did not vote for Mr Trump in 2020.

Vermont

Peter Welch, Democratic US Representative, quickly launched his Senate bid after Mr Leahy revealed he was stepping down. Mr Leahy, who is president pro tempore of the Senate, has been admitted to hospital a couple of times over the last two years.