President Joe Biden nudged further ahead in the Democratic nomination for re-election by winning the party caucuses in Wyoming and is the only choice on the ballot later in Alaska.

As two of the least populated states, Alaska and Wyoming play minuscule roles in both intra-party and general election voting in presidential election years.

Mr Biden effectively clinched the Democratic nomination on March 12 with the Georgia primary and is now all but certain to face former president Donald Trump as the Republican nominee in November.

Alaska Democrats are holding a voice vote for their party-run preference poll at in-person and virtual district meetings.

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Republican candidate former president Donald Trump is set to face Mr Biden (Jeff Dean/AP)

Mr Biden is the lone candidate eligible to receive votes after the other Democrat to qualify, Dean Phillips, suspended his campaign last month. The vote is being held during meetings where other party business is conducted.

The polling was delayed a week. Democrats had planned a ranked vote election by mail on April 6 but those plans changed when only Mr Biden and Mr Phillips qualified for the ballot, and when Mr Phillips suspended his run.

Changes to their plan were approved by the Democratic National Committee.

There were no provisions for write-ins or uncommitted, said Lindsay Kavanaugh, the Alaska party’s executive director.

“There is no option to vote nay,” she said. “You can abstain. You don’t vote yes or no, you vote for a candidate.”

The party proceeded with a vote, even with just one candidate, “to make sure we’re as inclusive as possible”, she said, and to avoid any inference that party leaders were deciding candidates themselves.

Alaska will allocate 15 pledged delegates based on the vote.

Meanwhile, Mr Biden won in Wyoming, where polling determined which candidate got the state’s 17 national delegates.

The caucuses also decided who goes to the state Democratic convention on June 1 in Casper. There, 13 of Wyoming’s national convention delegates will be chosen.

Wyoming’s other four “automatic” national delegates are the state party chairman, vice chair and two national committee people, who have not yet pledged for Mr Biden or anyone else.