The results of the Justice Democrats:
https://en.wikipedia.org/wiki/Justice_Democrats
They couldn't beat Republican governors in either VT or MD (not exactly unwinnable states for Democrats). They haven't gotten past a primary in a Senate seat. Let's go by every House seat they won and compare it to the 2016 presidential election:
AZ3- Clinton+29
CA17- Clinton+53
MA7- Clinton+72
MI13- Clinton+61
MN5- Clinton+55
NY14- Clinton +57
WA7- Clinton +70
So a grand total of one win where the margin was less than +50 Clinton over Trump. Those were the results before 2020.