Keep in mind—Robert F. Kennedy is a VERY FAMOUS name so that has something to do with his numbers climbing.
As bad as the duopoly is, sadly RFK, Jr. doesn't offer a sane alternative. I don't know what happened to him. He WAS a sane sensible and concerned environmentalist...and then, just like Guiliani, he transformed completely into a crazy man.
He's passionate about denying vaccines—a critical public health near miracle that (nearly) wiped out polio.
Vilifying vaccines because people don't remember polio is kind of like promoting fascism because you don't remember Mussolini or Hitler. Both vaccine denial and fascism should be completely off the table for anyone who understands history or reality.
RFK, Jr. lives in the same reality-free alternative universe inhabited by Trump, which is perhaps why he's working to ensure that Trump wins.
Oh, if we only had Kennedy's father with us...