In a 4-3 decision issued on January 12, the Ohio Supreme Court ruled the state House and Senate district maps drawn by Ohio Redistricting Commission are unconstitutional gerrymandering, giving Republicans a 62-37 advantage in the House and 23-10 advantage in the Senate.

The court ordered the Ohio Redistricting Commission, which is dominated by Republicans, to draw new maps in compliance with Article XI, Section 6 of the Ohio Constitution.

The new plan must be adopted within 10 days and the Ohio Supreme Court retains its authority to review any rewrites.

The decision was based in part on the fact that Ohio voters overwhelmingly approved changes to the state constitution to limit partisan line-drawing in 2015.