It helps that Trump’s ego still wants to claim credit for the speed of the vaccine development. Yeah, RFK may have been a Kennedy and had a background as an environmental lawyer, but then again Trump was a longtime Democrat from libtard paradise New York City, draft dodger who shit all over Vietnam vets and Gold Star families, and friend of the Clintons and Jeffrey Epstein, so MAGA gives no fucks about your past as long as you say the right thing.
And right now, RFK is drawing hard on the MAGA/Qanon playbook. I don’t think he can match Trump’s intensity and could get non-voters to necessarily show up, but he doesn’t have to - Trump has done the groundwork to get these people out, RFK up just has to come in and clean up. RFK is going to get the DeSantis folks and Qanon idiots because plenty of them are wanting somebody who actually walks the walk about vaccines and batshit conspiracies and the J6 morons, and Trump doesn’t quite get there (which is why DeSantis even got anybody out to support him).