If Rich withdrew, Johnson indeed might have a chance. But Johnson would be no different than Angus King. I can’t see him voting with us on anything, especially immigration or defense or the courts.
I don’t know what’s up with Gary Johnson (most of his support was soft I guess) but he’s running a bad 3rd in every recent poll so I see no reason not support Mark Rich, Heinrich will unfortunately win with at or around 50%, seeing him get in with 47 or 48% would reek of a missed opportunity.