For weeks now, Gov. Andrew M. Cuomo of New York, a Democrat seeking re-election this year, has been working behind the scenes to soothe misgivings by the leadership of a small but influential political party made up of labor unions and liberal activists who believe his policies have veered too far to the right.

Late on Thursday, a co-chairwoman of that group, the Working Families Party, said Mr. Cuomo’s efforts were not likely to be successful.

“Unless there is a significant new development in the next 24 hours, I don’t expect the state committee to endorse the governor,” said the co-chairwoman, Karen Scharff, who as executive director of the liberal advocacy group Citizen Action of New York wields considerable influence in the party.

Instead, she said, the party expects to put its support behind an academic with scarcely any chance to defeat Mr. Cuomo: Zephyr Teachout, a Fordham law professor who was the director of online organizing for Howard Dean’s presidential bid.