Lawyers for Mason, who was sentenced to five years in prison, say her provisional vote in 2016 wasn't an illegal vote because it didn't actually count.
The process, which allows voters to rank multiple candidates, will be in effect for the 2020 general election, but not the primary.
Voting rights groups want the state to pause the removals, noting that thousands of eligible voters are at risk of having their voter registrations canceled.
“The only way to know whether voters want to cancel their registration is to ask them," 7th Circuit Chief Judge Diane Wood wrote.
“It’s particularly rich that Republicans are claiming that the commission discriminates on the basis of partisan affiliation," one expert said.
Mason was one of nearly 4,000 people who had a provisional ballot rejected in her county during the 2016 election.
Some states haven't dedicated any money to preparing for the 2020 census, which determines representation in Congress and federal funding allocations.
John Gore faces accusations of lying about why a citizenship question was added to the census. A person familiar said his departure was unrelated.
Officials can discard such ballots if they decide signatures on them don't match ones on file. But the suit notes they aren't handwriting experts.
Places that were subject to federal supervision in the past still appear to be removing voters more aggressively today.
She's appealing a five-year prison sentence and fighting to save her home, all so the state can prop up the myth of "voter fraud." There are serious questions about the case against her.
J. Christian Adams, who served on Trump's voter fraud commission, helped author a report that published the citizens' personal information online.