Former Pinal County Sheriff Mark Lamb secured the Republican nomination for Arizona's 5th Congressional District on Tuesday, powering through months of sexual misconduct allegations that his wife dismissed as a "massive smear campaign."
The Associated Press projected Lamb's victory over construction business owner Daniel Keenan, who poured more than $1.5 million of his own money into a campaign built largely around the misconduct claims. CBS News reported Lamb will now advance to the general election in a deep-red district, replacing outgoing five-term Rep. Andy Biggs, who won the Republican nomination for Arizona governor the same night.
Lamb served as Pinal County sheriff from 2017 to 2024 and carried President Trump's endorsement into the race. Trump first backed Lamb last year, a move that prompted NFL veteran Jay Feely to drop out of the 5th District contest and switch to a run in Arizona's 1st Congressional District. Earlier this month, Trump reaffirmed his support on Truth Social, calling it his "great honor" to back Lamb.
That endorsement held even after a monthslong Arizona Republic investigation, published in late May, alleged that several women had accused Lamb of sending explicit messages and nude photos and then using threats or intimidation to cover it up. The investigation also reported that Lamb had initiated sexual encounters involving himself, his wife, and others, and that he made a racist joke and cheered other derogatory remarks in messages with a person described as a border extremist.
Lamb's campaign denied all allegations of misconduct, Politico reported. Lamb himself called the accusations "false and politically motivated," Newsmax reported, and his wife Janel went public in May with a Facebook post defending the family.
Janel Lamb wrote:
"Politics can be dark and ugly, but if you know us, you know that's not how we roll. After all we've been through, a massive smear campaign is certainly not going to stop us from doing what we know is right."
The allegations went beyond personal conduct. The Washington Examiner reported that multiple women accused Lamb of using his position as county sheriff to suppress the sexual misconduct claims, leveraging his law enforcement authority as a tool of intimidation. One woman separately accused the Church of Jesus Christ of Latter-day Saints of burying her complaints after she reported Lamb's alleged behavior to church leaders.
None of those allegations translated into criminal charges, and Lamb won by double digits, according to the Washington Examiner's account. The result suggests Republican primary voters in the district weighed Trump's endorsement and Lamb's denials more heavily than the Arizona Republic's reporting.
Texting scandals have become a recurring problem for political figures across the aisle. Trump himself pulled his endorsement from an Oklahoma pastor after a texting controversy surfaced in that race, a decision that underscores how seriously the White House can treat such allegations when it chooses to act.
Keenan, Lamb's primary opponent, bet heavily that the misconduct story would sink Lamb's candidacy. Newsmax reported that Keenan spent nearly $2 million of his own money trying to make the allegations the defining issue of the race. The strategy failed.
Trump's backing gave Lamb a structural advantage that self-funded opposition spending could not overcome. The president's initial endorsement last year cleared the field of Feely, a former NFL kicker who might have split the vote. And Trump's decision to reaffirm his support this month, weeks after the Arizona Republic's investigation landed, sent a clear signal to Republican voters about where the party's standard-bearer stood.
Questions about misconduct in public office have surfaced repeatedly in recent months. A top House Republican demanded a ban on lawmaker-staff relationships after a separate misconduct report, reflecting broader concern about accountability standards for elected officials and candidates.
Lamb now heads into a November general election in a district so heavily Republican that the primary was widely seen as the decisive contest. Fox News noted that the district's partisan lean makes Lamb a strong favorite to win the seat outright.
Several open questions remain. The Arizona Republic's investigation detailed communications and screenshots, but no law enforcement agency has announced a formal inquiry into Lamb's conduct. The outcome of the LDS Church's internal review of the woman's complaint has not been disclosed. And the identity of the "border extremist" with whom Lamb allegedly exchanged racist messages has not been made public in the available reporting.
Lamb's campaign has offered blanket denials but no detailed, point-by-point rebuttal of the specific allegations. Whether Democratic opponents or outside groups will press those unanswered questions in the general election remains to be seen, though in a deep-red district, the political incentive to do so may be limited.
The pattern of misconduct allegations surfacing against endorsed candidates presents an ongoing challenge for any party apparatus. Voters ultimately decide whether the allegations matter, and in this case, they rendered a clear verdict.
After the results came in, Lamb posted on social media. "Thank you Arizona," he wrote. "I am truly humbled by your support. I will never let you down."
Misconduct allegations involving public officials, from law enforcement officers caught in on-duty affairs to members of Congress, have become a fixture of modern campaigns. Lamb's primary win does not make the underlying questions disappear. It simply means the voters who showed up on Tuesday decided those questions were not disqualifying.
Accountability in public life should not depend on which party holds the endorsement. If the allegations against Lamb are false, he owes voters a fuller answer than a blanket denial. If they carry weight, a congressional office will only raise the stakes.
