Even if the RATS have a primary challenger, they have a convention before every primary election to choose their candidate that the party is backing. They have already picked their candidate before the open primary.
Then they vote for a RINO in our primary.
It is insane to have an open primary in Mi with that system in place.
The RINO threat in our primary however is real as can be. Rick Snyder. McCain 2000. Joe Schwarz 2004.