As pundits and politicos spar over whether Robert F. Kennedy Jr.’s presidential campaign will factor into the outcome of the 2024 election, one thing is clear:

Kennedy’s political following is built on a movement that seeks to legitimize conspiracy theories.

His claims decrying vaccines have roiled scientists and medical experts and stoked anger over whether his work harms children. He has made suggestions about the cause of COVID-19 that he acknowledges sound racist and antisemitic.

Bolstered by his famous name and family’s legacy, his campaign of conspiracy theories has gained an electoral and financial foothold. He is running as an independent — having abandoned his pursuit of the Democratic Party nomination — and raised more than $15 million. A political action committee pledged to spend between $10 million and $15 million to get his name on the ballot in 10 states.