On June 29, the U.S. Supreme Court ruled that state legislatures are not the only state government entities that can write or revise election laws that affect congressional elections. The decision is by Justice Ginsburg and is 5-4. The case is Arizona State Legislature v Arizona Independent Redistricting Commission, 13-1314.
The decision preserves the ability of ballot access activists to qualify initiatives for the ballot that improve ballot access laws. States with the initiative process for state laws and/or state constitutional changes are Alaska, Arizona, Arkansas, California, Colorado, Florida, Idaho, Maine, Massachusetts, Michigan, Mississippi, Missouri, Montana, Nebraska, Nevada, North Dakota, Ohio, Oklahoma, Oregon, South Dakota, Utah, Washington, and Wyoming. Illinois has a procedure that, in practice, is unworkable.
If the decision had gone the other way, the current initiative in Maine to use instant runoff voting for congressional elections would have been threatened, and prior initiatives easing ballot access laws, which have passed in Florida and Massachusetts, might have been at risk. Thanks to Rick Hasen for the link.