MADISON, Wis. (AP) — A chaotic Democratic primary for Wisconsin governor that has seen numerous candidates drop out and re-enter the race has threatened to leave thousands of voters who have already returned their ballots with worthless votes for the state’s top office.That possibility prompted the state Democratic Party on Tuesday to make a plea to the state elections commission, urging it to allow voters who already cast an absentee ballot to vote again. More than 80,000 ballots have already been returned.The request is all-but certain to result in a lawsuit with the primary just three weeks away.Democrats want to allow voters to cast new ballots after Lt. Gov. Sara Rodriguez, a Democrat, ended her campaign for governor on Friday and another candidate, Milwaukee County Executive David Crowley, rejoined the race with the endorsement of current Gov. Tony Evers. There are now five Democratic candidates actively campaigning for governor ahead of the Aug. 11 primary.Any voter who already returned an absentee ballot cast for Rodriguez would not be able to get a new ballot, based on guidance approved by the bipartisan Wisconsin Elections Commission earlier this month. The guidance was adopted after another Democratic candidate for governor, Missy Hughes, dropped out in June. Both Rodriguez and Hughes remain on the ballot even though they have ended their campaigns.The winner of the Democratic primary for governor is likely to face Republican U.S. Rep. Tom Tiffany, who has only token opposition. The seat is open after Evers decided against seeking a third term. Democrats hope to retain the office and flip both chambers of the Legislature to gain full control of state government for the first time since 2010.