Former Alaska Republican governor Sarah Palin has picked up a prized endorsement in her bid in an extremely crowded field to fill the unexpired term of the late US Representative Don Young.

Former president Donald Trump backed Ms Palin in a statement from his political action committee.

“Wonderful patriot Sarah Palin just announced that she is running for Congress, and that means there will be a true America First fighter on the ballot,” the statement says.

Trump Michigan
Former president Donald Trump (Junfu Han/Detroit Free Press via AP)

A total of 51 candidates signed up by the Friday deadline to run in a special primary following Mr Young’s death on March 18 at age 88.

The top four in the vote will advance to an August 16 special election, in which ranked choice voting will be used. The winner will serve until January, when the current term ends.

Some of candidates who filed for the special primary – including Ms Palin – have also filed to seek a regular two-term House term starting in January.

Candidates had until noon on Monday to remove their names from consideration. Three had withdrawn already.

Other candidates with name recognition include Nick Begich, grandson of former Rep Nick Begich, who died in office and held Alaska’s sole seat in the House before Mr Young was elected in 1973; a North Pole City Council member who legally changed his name to Santa Claus; former lawmakers John Coghill and Andrew Halcro; Anchorage Assembly member Christopher Constant; former US Senate candidate Al Gross; Emil Notti, an Alaska Native leader who narrowly lost to Mr Young in the 1973 election, and Josh Revak and Tara Sweeney, who were co-chairs of Mr Young’s re-election campaign.

This is the third time Mr Trump has issued an endorsement in Alaska races. Earlier he backed Kelly Tshibaka, a former state official, in her bid to unseat US Sen Lisa Murkowski.

Mr Trump has vowed revenge against Ms Murkowski, a Republican, after she voted to convict him in his impeachment trial and also called on him to resign after the January 6 insurrection at the US Capitol.

The other endorsement Mr Trump gave was to Alaska Republican Gov Mike Dunleavy, but that was conditional. Mr Trump said Mr Dunleavy would receive his blessing if Mr Dunleavy did not endorse Ms Murkowski, a condition and endorsement Mr Dunleavy accepted.

Ms Palin endorsed Mr Trump early in 2016 before he won the presidency that year.

“Now, it’s my turn,” he said, calling her a champion of Alaska values, energy jobs and its people.

Ms Palin in 2008 was selected by then-Sen John McCain to be his running mate against then-Sen Barack Obama. Mr Trump said she “lifted the McCain presidential campaign out of the dumps” — even though they were ultimately defeated by Mr Obama.

Mr Trump said he was “proud to give her my complete and total endorsement”.

Ms Palin thanked Mr Trump on Twitter, saying she was “honoured to have your support”.

The June 11 special primary will be conducted primarily by mail, a statewide first, with state election officials citing the tight timeline to hold the event as a major factor. The August 16 special election will coincide with the regular primary.

Voters in 2020 approved a new elections system that ends party primaries and institutes ranked voting for general elections. Those processes will be used for the first time in Alaska this year.

Elections officials are targeting September 2 to certify the winner of the special election.

The regular primary and November general election will determine who represents Alaska in the House for a two-year term starting in January.