On July 22, both the New York Conservative Party, and the New York Working Families Party, filed lawsuits in New York state courts to save fusion. Specifically, both lawsuits charge that the state legislature exceeded its authority when it empowered an unelected commission to decide whether to abolish fusion or not. The unelected commission was set up to draw up a plan for public funding for candidates for state office. The legislature gave it the power to impose a plan. Included in the commission’s power is whether or not to ban fusion.
Back in 1912, the New York state courts ruled that the State Constitution protects fusion. However, the Constitution has changed considerably since then. UPDATE: here is the Working Families Party Complaint . Hurley v Public Campaign Finance & Election Commission, filed in Niagara County Supreme Court.