Ohio voters will decide whether to overhaul the way state legislators draw congressional district lines in a May referendum after Democrats and Republicans reached a last-minute deal this week.

The measure will ask voters whether they want to amend the state constitution to require bipartisan support when drawing new congressional district lines. Any new maps would require three-fifths support in the state House and Senate, including support from at least half the members of the minority party.

If Republicans and Democrats in the legislature cannot agree on a map, a seven-member bipartisan commission would be assigned to draw new maps. Those maps would have to be approved with at least two votes from the minority party.

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If the bipartisan commission fails, the legislature would be allowed to try to draw 10-year maps that earn support from one-third of the minority party or a four-year map with only majority support.

The ballot measure came after weeks of negotiations between legislatures and an outside coalition, led by Ohio’s League of Women Voters. The coalition, Fair Districts = Fair Elections, gathered more than 200,000 signatures on a petition for its redistricting reform initiative and qualified for November’s ballot.

Just a week ago, the negotiations appeared stalled. But state Senate President Larry Obhof (R) and state Sen. Vernon Sykes (D) hammered out a final deal to reach a compromise.

“This compromise was hard-fought, down to the last minute, requiring concessions on both sides, and we are not entering into it lightly,” said Beth Taggart, executive director of the League of Women Voters of Ohio.

The constitutional amendment would also require at least 65 counties to be drawn wholly into a congressional district. New maps could not divide the cities of Cleveland or Cincinnati between districts.

“This plan ends the process of stretching districts far across the state, while maintaining the importance of the historic Voting Rights Act,” said state Sen. Matt Huffman (R), the sponsor of the compromise plan.

The Senate voted unanimously on Monday to approve the compromise. The House concurred Tuesday in an 82-10 vote. The measure will appear on the May 8 ballot, when Ohio voters pick party nominees in a statewide primary.

Ohio is just one front in the partisan war over how states draw congressional and legislative district lines. Voters in Michigan, Missouri and South Dakota are all likely to face redistricting reform initiatives in November, while the Supreme Court considers redistricting cases involving North Carolina and Wisconsin.

The Supreme Court said earlier this week it would not block a Pennsylvania Supreme Court ruling ordering new district boundaries in the Keystone State, where the Republican-led legislature had drawn lines that favor the GOP.

Ohio’s congressional district maps favor Republicans. The GOP holds 12 of the state’s 16 congressional seats, even though the party won only 58 percent of the two-party vote for Congress in the 2016 elections.

Several districts, like those held by Reps. Jim Jordan James (Jim) Daniel JordanHouse passes resolution condemning anti-Asian discrimination relating to coronavirus Republicans call for Judiciary hearing into unrest in cities run by Democrats Trump, GOP seek to rebut Democratic narrative on night one MORE (R), Bob Gibbs Robert (Bob) Brian GibbsOcasio-Cortez, Tlaib propose amendment to defund administration of 'opportunity zone' program House conservatives want ethics probe into Dems' handling of Kavanaugh allegations Judge rules against Trump attempt to delay Obama water rule MORE (R) and Jim Renacci James (Jim) B. RenacciOhio is suddenly a 2020 battleground Democrats fear Ohio slipping further away in 2020 Medicare for All won't deliver what Democrats promise MORE (R), snake from the Cleveland suburbs out into more conservative rural parts of the state, dividing several counties between different districts. Rep. Marcy Kaptur Marcia (Marcy) Carolyn KapturUkraine language in GOP platform underscores Trump tensions Eye on gavel, Wasserman Schultz proposes panel on racial inequality in spending Overnight Defense: Army now willing to rename bases named after Confederates | Dems demand answers on 'unfathomable' nuke testing discussions | Pentagon confirms death of north African al Qaeda leader MORE (D), whose district stretches from Toledo in the west to Lorain in the east, cannot drive her entire district without crowding into Republican-held territory.

Ohio Gov. John Kasich (R) has long been a proponent of reforming the way districts are drawn. Kasich pushed the Republican-controlled legislature to reform the way they drew their own district boundaries in 2015, though congressional districts were left out of that effort at the behest of Rep. John Boehner John Andrew BoehnerLongtime House parliamentarian to step down Five things we learned from this year's primaries Bad blood between Pelosi, Meadows complicates coronavirus talks MORE, then the Speaker of the House and a Kasich ally.

Kasich called for redistricting reform in his 2016 State of the State speech. He did not include redistricting reform in his budget last year, after GOP legislators said they would take up the issue once again.