Randy Feenstra

For years, securing Donald Trump's endorsement has been one of the safest bets in Republican politics in the US.

His backing has helped topple senators, members of Congress and state lawmakers who fell out of favour with the president. In many Republican primaries, Trump's support has become the closest thing to a political seal of approval.

That is why Tuesday's result in Iowa stood out.

Representative Randy Feenstra, who received Trump's endorsement just days before the election, lost the Republican primary for governor to Zach Lahn, a conservative political operative and farmer running as an outsider.

The defeat is one of the most significant primary losses for a Trump-backed candidate in recent years and offers a reminder that even Trump's influence has limits when local political dynamics move in a different direction, the New York Times reported.

Why Feenstra lost

The result was not necessarily a rejection of Trump himself.

Many Iowa Republicans who voted for Lahn remain strong Trump supporters. Instead, the race highlighted a recurring lesson in American politics: an endorsement cannot always rescue a struggling campaign.

Feenstra entered as the better-known candidate and sitting Congressman, but many Republicans found his campaign uninspiring. Lahn, on the other hand, positioned himself as a grassroots conservative outsider, which really spoke to voters wanting change from the political status quo. Timing likely played a key role too.

Though Trump did endorse Feenstra near the end, it was only a few days before voting, not giving the campaign much time to benefit from it. In the end, it seems local dynamics mattered more than getting a big-name endorsement.

Democrats suddenly see an opportunity

The Republican upset could have implications beyond the primary.

Iowa has shifted sharply toward Republicans in recent years, but Democrats believe the governor's race offers one of their best statewide opportunities in 2026.

Their candidate, state auditor Rob Sand, has built a strong fundraising operation and enjoys broader name recognition than many Democrats in the state.

With outgoing Republican Governor Kim Reynolds not seeking another term, Democrats see the race as unusually competitive.

Whether Lahn's outsider appeal translates into success in a general election remains one of the biggest unanswered questions heading into November.

A victory for the Democratic establishment

While Republicans were digesting Feenstra's loss, Iowa Democrats delivered a victory to a candidate strongly backed by party leadership.

State representative and Paralympic gold medallist Josh Turek comfortably won the Democratic Senate primary.

Turek benefited from substantial financial support from VoteVets, a veterans organisation aligned with Senate Democratic leader Chuck Schumer. His opponent, state senator Zach Wahls, attempted to run as an anti-establishment challenger who argued that Democrats needed a new direction.

The result suggested that despite frustration among many Democratic voters after recent election setbacks, establishment-backed candidates still hold significant advantages when they possess major financial support.

Turek will now face Republican Representative Ashley Hinson in a race Democrats hope could help them chip away at the GOP's Senate majority.

Progressives notch another win

Elsewhere, progressives scored an important victory in New Jersey.

Retired Army surgeon Adam Hamawy, backed by Senator Bernie Sanders and Representative Alexandria Ocasio-Cortez, won a crowded Democratic primary for a safely Democratic congressional district.

The victory adds to a growing list of successes for progressive candidates in New Jersey this year and suggests that the Sanders wing of the party continues to maintain influence in certain parts of the country despite broader Democratic debates over strategy and leadership.

The bigger message from primary night

The most important takeaway from Iowa may not be that Trump is losing control of the Republican Party.

His influence remains enormous, and most of his endorsed candidates continue to win.

Instead, the result serves as a reminder that endorsements alone do not guarantee victory. Candidate quality, campaign execution, local political relationships and voter enthusiasm still matter.

For months, political observers have debated whether Republicans are beginning to show signs of independence from Trump as disagreements emerge over issues such as Iran, spending and executive power.

Iowa's governor's race does not answer that question definitively.

But it does show that even in today's Republican Party, voters occasionally have a mind of their own.