Senator Michael Bennet of Colorado Will Run for Governor

Mr. Bennet, who will be able to keep his Senate seat as he pursues the governor’s mansion, is the latest Democratic senator to seek to move on from Congress.

Senator Michael Bennet, Democrat of Colorado, is planning to announce on Friday that he will run for governor next year, according to two people with knowledge of his preparations.

The move by Mr. Bennet, who has served in the Senate since 2009 and ran for president in 2020, makes him the latest Democratic senator to plan to move on from Congress. He is not up for re-election in the Senate until 2028, meaning he can keep his seat as he pursues the governor’s mansion. Axios earlier reported Mr. Bennet’s planned move.

Gov. Jared Polis, a Democrat who has led the state since 2019, cannot run for re-election because of term limits. Colorado, once a political battleground, has not elected a Republican governor since 2002, making Mr. Bennet a strong contender to be the next chief executive of the state.

But first, he will face Phil Weiser, the state’s Democratic attorney general, who has already announced a bid. Mr. Weiser has emerged as a high-profile opponent of the Trump administration, joining with other state attorneys general to file lawsuits over a series of policies and executive orders.

With Mr. Bennet’s national brand and strong fund-raising ability, he is likely to become the front-runner in the governor’s race. His entrance is also likely to dissuade other possible Democratic candidates from jumping into the contest.

A former Denver Public Schools superintendent, Mr. Bennet was appointed to the Senate in 2009, and has won re-election three times. He ran as a moderate candidate in his party’s crowded 2020 presidential primary race, but his campaign failed to catch fire and he did not qualify for most of the debates.