Wyoming: Here’s how to vote, where to vote and what’s on the ballot.

The political world’s gaze on Tuesday will turn to Wyoming, where Representative Liz Cheney, a top target of the midterm election revenge tour of former President Donald J. Trump, is bracing for defeat in a Republican primary.

Ms. Cheney, the vice chairwoman of the Jan. 6 committee who voted last year to impeach Mr. Trump, has been badly trailing Harriet Hageman, the Trump-backed challenger, in polls.

It is not the only contested race on the ballot. Here is a refresher on the rules for voting and what is at stake.

How to vote

Wyoming provides same-day voter registration, unlike many states with early deadlines for participating in elections. Residents who meet the state’s eligibility requirements can register in person at their polling place until 7 p.m. Mountain time on Tuesday.

You have to be registered with a political party to vote in the primary. Voters can change their party affiliation at their polling place on Tuesday.

Where to vote

Click here to look up your assigned place to vote. Absentee ballots must be received at your county clerk’s office by Tuesday at 7 p.m. Mountain time, which is also when the polls close for in-person voting.

What is on the ballot

In deep-red Wyoming, the Republican primary winner for the state’s lone House seat is virtually assured of being elected in November. The Democratic primary features three candidates.

In the governor’s race, the incumbent, Mark Gordon, is facing three Republican challengers, while Democrats will choose between two candidates.

Voters will also decide various intraparty races for secretary of state, state auditor, the Legislature and county offices.

The state does not have a central website where voters can see a preview of their full ballot, but Ballotpedia offers a sample ballot tool.