I think Bernie should run, alongside AOC, Walz, Al Green, and others. The primary can sort out who is truly best as president. That is the whole bloody idea of a primary, one the DNC never honestly permitted after Obama's tenure.
The reason why the conservatives found an effective candidate in Trump, is that he was allowed to legitimately compete in their primaries. It is a stress test, and the DNC refused to allow their own primary to work as intended.
Chuck is a schmuck.
You don't negotiate people who have a proven history of not dealing in good faith.