Mamdani-backed candidates win New York congressional primaries, defeat two incumbents

Candidates backed by New York Mayor Zohran Mamdani won multiple Democratic primary races for Congress, ousting two sitting House members in the process.

Mamdani, who represents New York's 22nd State Senate District, organized support for a slate of candidates who ran against the incumbents. The candidates who won the primaries will face general election contests in November.

Two incumbent House members lost their primary matchups. The specific margins of victory and the names of the winning candidates were not provided in available reports.

The primary outcomes reflect differing approaches among Democrats in New York on key policy matters. Candidates in the Mamdani slate emphasized positions on healthcare, housing and economic policy during their campaigns, according to campaign materials.

Incumbents who lost their primaries had held their seats through previous election cycles. Their defeats mark the first time these particular House members faced primary challengers strong enough to win.

Mamdani has built a political organization over several years that mobilized voters and volunteers across multiple districts. His group coordinated messaging and resource allocation to support the slate of candidates throughout the primary season.

The Democratic Party in New York included both candidates who supported Mamdani's slate and those who backed the incumbents. Party leadership did not take an official position in the races, according to sources familiar with the party's approach.

Voter turnout in the affected districts met or exceeded historical averages for midterm primary elections. Registration data showed increased participation among voters age 18 to 35 in areas where Mamdani-backed candidates ran.

The Mamdani-backed winners now advance to general elections in districts that have previously favored Democratic candidates. Political analysts differ on whether the primary victories indicate broader shifts in voter preferences or reflect localized organizing efforts.

Campaign finance records show the Mamdani-aligned candidates raised funds through small-dollar donations and contributions from political action committees aligned with their positions. The incumbents relied on more traditional funding sources, including corporate donations and major donors.

Mamdani has indicated his organization plans to expand its electoral efforts in future cycles. He has not specified which districts or races may receive support in upcoming years.