"With the two exceptions noted above, FCP believes this flier constitutes rhetoric or political discourse of the sort that is normal and acceptable in a vigorous campaign for public office," said the written statement.
The FCP findings do not come with any legal ramifications, nor are they intended to sway the decisions of voters.
After the five-member panel's ruling, Hynes said she believed the comparison piece was valid.
"It's up to the voters, and I stand on my experience and leadership."
Southworth lost her bid for a town council seat last year to Paul Farnan, who resigned in February. Hynes was chosen from a number of candidates including Southworth and appointed to the open slot. Under public service law, Hynes must now be elected to continue to serve.
Contacted Saturday night, Southworth's son Jason Southworth read a prepared reply to the FCP findings.
"This ruling shows that you can no longer get away with negative campaigning and character attacks in Ballston."
In a race marred by purported events such as campaign signs being knocked down or set on fire, voters in the Town of Ballston will hold the final outcome in their hands on Tuesday.
"Ultimately, it is up to the voters," said LWV spokesperson Barbara Thomas, contacted late Saturday night. "The ruling is not the only thing for voters to consider. They must consider who best meets their interests and who best represents their views."