A group of about a dozen progressive activists delivered more than 80,000 petition signatures Thursday to the Capitol Hill offices of Senate Minority Leader Chuck Schumer (D-NY) and House Democratic Leader Hakeem Jeffries (D-NY), pressing them to endorse Zohran Mamdani, the Democratic nominee for New York City mayor.

Mamdani, 33, has gained a large base of support from the left flank of the Democratic Party, leaving many party leaders and centrists in a tough spot.