When U.S. Sen. Steve Daines pulled out of his reelection bid in the final minutes of Montana's candidate filing period, he handed the state something it hasn't seen in a long time: a wide-open U.S. Senate race with no incumbent on the ballot.

The Republican establishment moved quickly to close ranks. Daines, Gov. Greg Gianforte, U.S. Sen. Tim Sheehy, and President Donald Trump all threw their weight behind former U.S. Attorney Kurt Alme, signaling that party leadership had a preferred successor in mind before the dust had settled.

But a primary is a primary. Despite the unified endorsement push from the top of the ticket, Alme is not running unopposed. Two additional Republican candidates filed before the deadline, setting up what could be the most consequential GOP primary Montana has seen in years — one where national party muscle is being tested against whatever appetite voters have to make up their own minds.

For Helena-area voters, the race carries weight beyond the Senate chamber. Lewis and Clark County has historically served as a bellwether in statewide contests, and the outcome of the primary will shape which direction Republican candidates pitch themselves heading into the general election. Filing has closed; the next significant milestone will be the primary election.