It’s worth remembering that @RobertKennedyJr began as a Democratic candidate, wanting to challenge Biden.
But the DNC said it would not permit any primary, or any debates: the nominee would be Biden, period.
Only after that anti-democratic decree did he become independent.
Democrats bled RFK JR campaign dry. It would take 100 million to fight the lawfare. The Democrat machine is impressive in its fascism.