I worked in Phyllis Kahn's first campaign for office some 30 years ago +/-2yr. Her main primary opposition (it was a district where GOP registrations could stuff a phone booth) was a rascal named Matt Stark, a former pres. of the MCLU (Minnesota chapter of ACLU). Ironically, she was a victim of Stark campaign workers (some say Stark himself was seen) stealing her campaign literature and vandalizing her supporters' lawn signs. I don't think any charges were pressed; victory was the sweetest revenge.
Her husband, Don, is (or was) a prof. of mathematics at the University of Minn. I think she's still a "safe" candidate in a "safe" district, so this may be embarassing, but not fatal to her re-election prospects. If I still know her at all, my guess is that if the case is pressed, she will probably plead guilty to a negotiated charge and pay a fine (especially if reminded of the history of her original campaign, where she was the victim rather than the perp).
Her district isn't the issue. The district in question (where she was helping another candidate) is a swing district. As I recall, last election the Republican won by 65 votes, and the election before that the Dem won by 200 votes.
Every vote is critical there, and the Dems are desperate to take back the Minnesota house, something they tend to view as rightfully theirs - they can't stand the fact that the Pubbies have a majority there.