RFK Jr. to challenge Biden in 2024 presidential race.

Robert F. Kennedy Jr., a vocal anti-vaccine activist, has filed paperwork to challenge Joe Biden for the Democratic presidential primary. Kennedy is a scion of one of the few remaining political dynasties in American politics and has a public profile that predates his anti-vax turn. However, his anti-vaccine views present a significant political challenge to his hope of appealing to Democratic voters, who have been far more supportive of the public health response to the pandemic than Republicans.