Democratic Rep. Greg Stanton has turned back a primary challenge from his left flank, defeating progressive organizer Kai Newkirk in Arizona's 4th Congressional District, according to Decision Desk HQ projections. The victory keeps a moderate incumbent in place for a safely blue seat this fall.
Stanton, a former Phoenix mayor, faced relentless criticism from Newkirk over his acceptance of corporate campaign donations and his vote last year for the Laken Riley Act, a border enforcement bill that divided Democrats. Newkirk, who led the Democracy Spring sit-in at the U.S. Capitol in 2016, sought to tap into the same progressive energy that has ousted incumbents in New York and Colorado this cycle.
But the momentum that carried left-wing challengers elsewhere failed to materialize in the Phoenix-area district. According to The Arizona Republic, Newkirk struggled to gain traction, and his campaign was further complicated when several organizations and figures pulled endorsements after Graham Platner exited a Maine state Senate race amid sexual assault and misconduct allegations. The outlet noted no allegations have emerged against Newkirk.
Our Revolution, the group founded by Sen. Bernie Sanders (I-Vt.), backed Newkirk, while Stanton secured support from American Israel Public Affairs Committee-aligned groups and Arizona Rep. Adelita Grijalva (D). The contrast underscored the ideological fault lines within the party—Stanton's centrist stance on Israel and corporate money versus Newkirk's progressive platform.
Stanton will now face Republican Zuhdi Jasser, a physician who unsuccessfully sought the GOP nomination in 2024. The district leans heavily Democratic, making Stanton the heavy favorite in the general election.
Newkirk's loss comes amid a broader pattern of progressive primary successes elsewhere, but in Arizona's 4th, the incumbent's moderate profile and local roots proved resilient. For context on the state's broader primary landscape, see our coverage of Arizona's primary preview, which highlighted the stakes for House control and the influence of former President Trump.
The race also reflects ongoing intraparty tensions over campaign finance and foreign policy, as seen in Democratic infighting over candidate support. Stanton's victory suggests that in some districts, moderate incumbents can still weather the progressive wave.
