His successor, County Clerk Myrl Gue, said having to send out the 7,000 cards again will "really look bad."
Gue was not part of the Whitten team and appears to be taking on the so-called "courthouse gang" critics say has run Lincoln County for far too long.
Gue hopes Judicial Watch will look at what his office has done and decide not to sue.
"I hope they would take into consideration where it was at and the amount of work we've taken to get back to where it should be," he said.
Tennant said she is proud of the efforts of Boone and Lincoln officials and has dispatched officials from her office to help.
She said Lincoln now is working hard to maintain voter lists correctly.
"They weren't quite doing the maintenance correct, and they realized that, and we've been working with them," she said.
Tennant said the numbers in Boone and Lincoln look bad but purging the rolls takes time because officials should give the benefit of the doubt to registered voters.
As for the threatened Judicial Watch lawsuit, she said, "It's not our issue, it's somebody else's, because we've been addressing it for a while."
There are three basic reasons a person should lose voting rights in a county: if they die, if they move or if they are in prison. County officials are tasked with maintaining their records, Tennant said. But while officials are supposed to get constant updates on who is in prison and annual updates on people who have died, it's not as easy to track those who have moved.
County officials who suspect somebody has moved must send the voter a letter. If there's no reply, the county can put the voter on inactive status. If the voter doesn't return the card but shows up to vote in one of the next two general elections, the voter can become active again. If the voter doesn't vote after four years, their registration can be cancelled.
Officials can't disqualify a person just because they haven't voted in a while, state election officials said. There has to be a combination of no recent voting history and uncertainty about the person's address. This means efforts to purge voter rolls can lag behind population changes even if county officials are doing things correctly.
Tennant said she backed legislation that would have made it easier to update voter rolls. The bill died in the Legislature.
The bill would have required the state Department of Health and Human Resources to give county election officials monthly reports on deaths so the counties could quickly update their records. Currently, the reports are required only yearly.
The bill also gave Tennant power to ensure counties are doing "routine file maintenance." Right now, Tennant said her hands are somewhat tied and much is left to county clerks.
"We were basically wanting to make us more responsible," Tennant said of her office.
Tennant said her office pushed to get the bill on the agenda for the December special session. Instead, the session was devoted solely to gas regulation. Tennant said she then pushed to get it passed during this year's regular legislative session, but it did not advance.