I don’t think Mitch holds much sway over the good people of Wyoming so it doesn’t matter what he says.
Obviously, China Mitch thinks Cheney is in a safe position. With GOPe support and an open primary he is probably correct. I see it as maybe 50/50 that she loses her seat. Maybe less.
GOPe is about 8% of the party. If that.
WY has closed primaries; only registered Republicans can vote in the primary, and there is of course no runoff option.