Zellnor Myrie, center, and other IDC challengers

The Working Families Party is escalating its efforts to unseat members of the breakaway Independent Democratic Conference of the New York State Senate. The WFP, a progressive political party that regularly cross-endorses Democrats, is rolling out additional endorsements of candidates challenging IDC members in this year’s elections, which include all the seats in the state Legislature.

The IDC has a power-sharing agreement with Senate Republicans that helps keep the GOP in control of the upper chamber of