Weird, I was just looking at how to recall senators and Minnesota requires:

• $100 + 25 resident signatures
• file a petition: “The grounds must be one of the following: malfeasance, nonfeasance, or serious crime”
• State Supreme Court decides if its worth hearing, then set up a court date
• hearing to decide if grounds for recall are valid
• get 25% of the number of votes cast in the last general election within 90 days