Anthony Constantino leads the NY-21 Republican primary market at 80% implied probability, driven primarily by President Trump's endorsement and his profile as a business outsider emphasizing economic development and manufacturing. State Assemblyman Robert Smullen trails at 21%, supported by the New York Republican Party organization and endorsements from most county committees, which highlight his legislative experience and military background. The race has featured sharp exchanges, including campaign finance complaints and a contentious May debate that underscored personal divisions ahead of the June 23 primary. With the contest days away, trader positioning reflects the typical advantage of high-profile national backing in Republican primaries over local institutional support.