Here’s the danger — many Republicans who do not support Donald Trump would likely support RFK, Jr. — certainly much more readily than they would Joe Biden. For this reason, Robert Kennedy is a threat also to the GOP apparatus and surely the Trump campaign, as he is a much more capable general election opponent than the current bumbler-in-chief.
He is a threat to both parties but more to the left because he is still a climate change guy and liberal in other ways. He is his own guy and not a loon, so the wokester folks will hate him.
People don’t know where he stands on issues. There will be no debate on the RAT side because Biden is incapable of making any sense, so Robert would have to find a way to get his message out.
Libertarians will prove they are the worst "uniparty" after all. They are already trading their Tiger Beat magazines across the aisle.
He certainly would be a VASTLY more dangerous opponent in a general election.
But the Democrat party establishment will make sure it never comes to that. They have more levers of power to use against insurgent candidates than the Republican party establishment does - eg super delegates.
The good news is that in blatantly screwing him over and showing how corrupt they really are, they will push a lot of people into the Trump camp.