All these survey always are pointless, asking a representative sample of people how they'd vote for a name that 30% won't recognise is worse than useless.
I mean, he's breathing and running against Trump. Anyone who I wouldn't vote for in that situation is going to have to be so awful they'd certainly be famously notorious.
coughrfkjrcough
(Although if those were literally the only two options, I would vote for RFK under the assumption that not everyone he would staff the admin with would be as awful)