Surely the Democrats are not going to run Joe Biden. They are going to pull a rabbit out of their hat right before the election. Someone way left wing that will get the little vote Kennedy would have gotten.
Can't be Kamala so ditching her is a thorny problem.
I'm sure there are people on the left tho that will ONLY vote Biden and any RFK or switcharoo would keep them home. I'm not saying they're smart - I am saying they exist. There's a jag out there for Joe. I guarantee it.