A review of the latest voter registration tallies by Center for Media and Democracy (CMD) finds that almost 700,000 Wisconsin voters have been removed from the voter rolls since the end of December 2016, and that significantly more voters were purged from the rolls in Democratic leaning counties than Republican leaning counties.

The high number of purged voters could create major headaches on November 6, especially if turnout is as heavy as expected.

Wisconsin has participated in the Electronic Registration Information Center’s (ERIC) list maintenance program since 2016, which involves sending postcards to voters who are suspected of moving. If the voters don’t respond, they are removed from the rolls. Ninety percent of voters do not respond, but that doesn’t necessarily mean they have actually moved.

Due to the voter purge operation, the number of registered voters in Wisconsin dropped by 697,363 between January 2017 and February 2018, a decrease of 19%. In addition to a major purge in the summer of 2017, 232,358 voters were removed in January 2018.

Voter rolls have rebounded somewhat since then, thanks to high levels of interest in the upcoming midterm elections and voter registration drives. But as of October 1, the state voter rolls were still down by 566,012, a 15% decrease.

The number of purged voters has been especially dramatic in Milwaukee and Dane counties, the state’s two heaviest Democratic strongholds, where nearly one in four voters have been removed from the rolls.

Milwaukee County has lost 150,954 voters since the end of 2016, a 26% decrease; Dane County has lost 88,254, a 23% drop.

The data comes from monthly reports from the Wisconsin Election Commission.

“It is very likely that thousands of voters will show up to vote in November only to find that they are no longer registered,” said CMD’s David Armiak. “Fortunately, Wisconsin allows election day registration, but this could lead to confusion and delays during what is expected to be a high turnout election. Voters should be sure to bring proper identification with their correct address with them to the polls.”

There were reports of problems with mistakenly purged voters in the spring elections this year. More than 7,000 voters had to be reinstated after the February 2018 primary election due to errors in the purge program.

The voter registration drop comes despite a widely reported surge in Democratic voter enthusiasm this year, and a Dane County Democratic turnout in the spring primary that was 40 percent higher than the previous record.

Wisconsin voters can confirm their voter registration here.

CMD is printing in full a statement in response to our story from the Wisconsin Elections Commission.