A Harlem congressional challenger is riding Mamdani-style left-wing momentum into a primary fight against a longtime incumbent, with Fran Lebowitz cheering on taxes that have billionaires threatening to flee.

• Fran Lebowitz said billionaires like Ken Griffin who threaten to leave NYC over higher taxes should just go, arguing their money does not employ anyone and their $100 million apartments push up rents for everyone else.
• Mayor Mamdani is pushing a pied-à-terre tax on luxury apartments owned by people who do not actually live in them.
• Daria Lisa Ava Shavalier, a community organizer endorsed by Justice Democrats and DSA, is challenging incumbent Adriano Espayat in the June 23 Harlem primary.
• She wants to abolish ICE, stop sending weapons to Israel, fund public schools and public housing, and says Espayat has been absent on local issues like ICE raids and crumbling NYCHA buildings.
• The race is being framed as a test of whether last year's Mamdani win was a fluke or the start of a broader working-class left coalition in New York.

Outlook: The June 23 primary will show whether the NYC left can take down an incumbent congressman after winning the mayor's race.