Anti-vaxxer Robert F. Kennedy Jr. on Wednesday announced a long shot 2024 Democratic presidential campaign. The scion of the legendary political dynasty poses little threat to President Biden and has been criticized by his family. But RFK Jr. could use his bold-faced family name to spread discredited claims that vaccines like the life-saving COVID-19 shots pose health risks. Advertisement Kennedy, 69, launched his campaign in Boston with a video heavy on imagery from the heyday of his slain father Robert F. Kennedy and uncle President John F. Kennedy. Robert F. Kennedy Jr. announces his run for president on Wednesday, April...