Reps. Ilhan Omar, Dean Phillips, Betty McCollum, and Angie Craig have called for President Trump to be removed from office.
The Minnesota representative says she is drawing up articles of impeachment.
First-term incumbent Ilhan Omar will face Republican challenger Lacy Johnson.
The Democrats were doing it as part of a Get Out The Vote effort.
She said Trump and the GOP are "actively spreading a deadly virus."
The video by the right-wing sting group has sparked debate in Minnesota.
An official tally won't be compiled till later this week due to a late deadline for absentee votes.
The rookie Congresswoman is set for a second term.
The DFL is accusing Melton-Meaux's campaign of violating federal election law.
Democrat Antone Melton-Meaux's campaign raised $1.5 million in May.
Lacy Johnson is running against Ilhan Omar.
Nur Omar Mohamed had been in a coma as he battled the virus.
He had been accused by his ex-wife of being romantically-involved with Rep. Omar.
The Minnesota congresswoman said talks of a possible war with Iran were triggering her PTSD.
The candidate has denied the letter, saying his campaign manager wrote it.
She suggested Rep. Omar should be "tried for treason and hanged."
She says giving him a stern sentence will just fuel his anger and resentment.
Sanders and Rep. Ilhan Omar proposed a bill in October to provide free meals to students across the country.
He was joined by Rep. Ilhan Omar at the Williams Arena.
He'll be joined by Rep. Ilhan Omar in her home district.
He has since removed the photo after widespread criticism.
She's the only Minnesotan DFL representative not to endorse Amy Klobuchar.