Polls suggest that most New Yorkers are unfamiliar with Delgado, but he has more than a year to make his case to voters.

Mr. Delgado, New York’s lieutenant governor, said he would take on Gov. Kathy Hochul in next year’s Democratic primary because her tenure had lacked “bold, decisive” leadership.

New York Lt. Gov. Antonio Delgado launched a Democratic primary challenge against Gov. Kathy Hochul on Monday, saying in a video announcing his campaign that the state needs “bold, decisive, transformational leadership.