The U.S. Supreme Court has agreed to hear a challenge from Maryland whether it was proper for a single federal judge to throw out a lawsuit challenging Maryland’s 2011 congressional redistricting plan. Statute requires three judge panels to hear statewide redistricting plans, whether for Congress or state legislatures. More information on Shapiro v. Mack can be found on SCOTUSBLOG.
Three judge federal panels have heard state and congressional challenges in New York. Notable recent cases include Flateau v. Anderson, FAIR v. Weprin and Favors v. Cuomo.