The DFL is accusing Melton-Meaux's campaign of violating federal election law.
Joe Biden and Bernie Sanders appear to be the frontrunners.
Sanders is polling well in Minnesota ahead of the crucial vote.
Sanders carried the state in 2016 against Hillary Clinton.
So much for the Klobuchar-Buttigieg Midwest ticket.
Only a tiny fraction of results had been reported by late Monday evening.
A recent investigative article suggested the teen convicted on Klobuchar's watch may be innocent.
This time, he'll be visiting the Twin Cities.
Early voting started on Friday.
She's the only Minnesotan DFL representative not to endorse Amy Klobuchar.
John Mason is a first-time candidate.