A new poll gave Platner a double-digit lead over Mills among Maine Democrats in the race to take on GOP Senator Susan Collins.
It's been two months since a Penobscot County woman reported finding 250 Maine ballots in a package. State officials said they must be 'slow and meticulous' with their review.
Voters in House District 94 will choose a new representative Feb. 24 following the resignation of former Rep. Kristen Cloutier.
This is the first time Maine Conservation Voters, founded in 1986, has endorsed someone in a gubernatorial primary.
In Maine's latest statewide election, half of the absentee ballots cast and counted were returned by Democratic voters, more than twice the number by Republicans.