Sen. Jim Risch is fighting to hold onto the Republican nomination in Idaho's Senate primary on Tuesday, as a slate of challengers from both parties seek to unseat the incumbent. The race is part of a broader primary night that includes contests in several states, with political observers closely watching for signs of voter sentiment ahead of the general election.

Risch, a veteran GOP figure, faces a handful of Republican opponents who have criticized his record on issues ranging from federal spending to border security. On the Democratic side, a similar dynamic is unfolding, with candidates vying to advance to the November ballot. Polls across the state close at 8 p.m. PDT, and results are expected to trickle in throughout the evening.

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The Idaho contest comes amid a heated primary season that has seen former President Donald Trump exert influence in races like Kentucky's, where he targeted Rep. Thomas Massie. In Idaho, however, Trump has not taken a prominent role, leaving the primary to unfold largely on local dynamics.

Risch's campaign has emphasized his seniority and committee assignments, arguing that he is best positioned to deliver for Idaho in Washington. His opponents, meanwhile, have painted him as out of touch with grassroots conservatives, a charge that has gained traction in other primaries this cycle.

The Democratic primary features candidates who have focused on healthcare access and economic inequality, hoping to capitalize on broader national trends. However, Idaho's deep-red lean makes the general election an uphill battle for any Democrat.

This primary is one of several taking place on Tuesday, with similar contests in states like Alabama and Georgia. In Alabama, Barry Moore leads the GOP field to replace Sen. Tommy Tuberville, while in Georgia, a federal judge recently halted misconduct claims against Supreme Court candidates, adding a layer of legal drama to the election season.

For Idaho voters, the primary represents a chance to shape the state's representation in a closely divided Senate. Risch's fate could signal whether incumbency remains a powerful force or if anti-establishment sentiment is rising even in reliably Republican states.

As results come in, Decision Desk HQ will provide live updates. The outcome will set the stage for a general election that, while likely favoring the GOP nominee, could still see competitive races down the ballot.