I can't see how the Democrats don't suffer somewhat from the follies affecting Messrs Northam, Fairfax, and Herring. How badly that will hurt remains to be seen.
The Democrats would still win with any of these candidates. Democrats just need to run a pro-capitalist moderate (to somewhat liberal on social issues) to win Virginia now. A socialist like Bernie would obviously not do, but a moderate, even with personal issues, has a substantial advantage in the state. NoVa's margins have become too overwhelming to overcome downstate. The only way for a Republican to win is to cut into those margins. The only way to cut into those margins is for an unacceptable democrat to run. But the personal issues of those three don't = unacceptable for NoVa voters.