Trump. The victory in the Republican primary for New York’s 21st Congressional District effectively positions Constantino as the heavy favorite to succeed Representative Elise Stefanik, who is expected to vacate the seat for a role in the Trump administration.

Constantino handily defeated New York State Assemblymember Robert Smullen in what became a bitterly fought contest, with both candidates trading accusations over conservative credentials and local ties. The race drew national attention after Trump threw his weight behind Constantino in the final weeks, a move that scrambled the local political calculus and elevated the primary into a proxy fight over loyalty to the former president’s brand of politics.

The 21st District, which stretches across a swath of upstate New York from the Adirondacks to the Canadian border, is one of the most reliably Republican seats in the state. Stefanik, who has held the seat since 2015, is poised to step down after being tapped by Trump to serve as U.S. ambassador to the United Nations, a position that requires Senate confirmation. Her departure has set off a cascade of political maneuvering, with the primary serving as the first major test of the district’s post-Stefanik alignment.

Smullen, a three-term assemblyman from the Mohawk Valley, had sought to position himself as the steady, experienced conservative in the race, highlighting his legislative record and deep roots in the district. But Constantino, a political newcomer with a personal fortune built from his e-commerce business, flooded the airwaves with ads portraying Smullen as a career politician out of step with the party’s grassroots. The contest grew increasingly personal, with Smullen questioning Constantino’s commitment to the district and Constantino dismissing Smullen as a creature of Albany.

Trump’s endorsement, delivered via a statement on his social media platform, proved decisive. In it, the former president praised Constantino as a “highly successful businessman” who would “fight for America First policies,” while criticizing Smullen as a “RINO” who had failed to fully embrace the MAGA agenda. The backing gave Constantino a surge of momentum in the final stretch, helping him consolidate support among the district’s Trump-aligned base and overcome Smullen’s organizational advantage in local party circles.

A Shift in the Political Landscape

The outcome signals a notable shift in the district’s political identity. Stefanik, once a moderate Republican, transformed herself into one of Trump’s most vocal defenders in Congress, a pivot that won her national prominence and the UN nomination. Constantino’s victory suggests that the district’s GOP voters are now fully aligned with that transformation, favoring an outsider with business credentials and Trump’s seal of approval over a traditional legislator with a decade of public service.

With no serious Democratic challenger expected in the general election, Constantino is all but certain to claim the seat in the coming months. His campaign has already signaled a focus on border security, economic deregulation, and opposition to what he calls the “Biden-Harris agenda,” a platform that mirrors the national GOP playbook. For now, the Sticker Mule CEO is preparing to trade the boardroom for the House floor, carrying with him the endorsement of a former president and the weight of a district that has firmly chosen disruption over experience.