A coalition of law firms led by Boies Schiller Flexner and the League of United Latin American Citizens (LULAC) announced Wednesday they filed lawsuits in four states challenging the winner-take-all method used to allocate electors in presidential elections.

The lawsuits—filed in two Democratic-leaning states, Massachusetts and California, and two traditionally Republican states, South Carolina and Texas—claim the winner-take-all system violates the constitutional rights to free association, political expression and equal protection.