FDR was hugely successful, but part of the reason we still don't have universal healthcare is conservative southern democrats decided it was a threat to segregation. FDR tried to take them out, but couldn't.

In contrast the right does whatever Trump says, no matter how many kids he rapes. They have an idea where the country should be in 50 years, whatever the cost. I haven't seen that level of discipline from the left. I hope it's there now post-Trump, but it certainly wasn't there during the Obama midterms.