Robert F Kennedy Jr, an anti-vaccine activist and scion of one of the most famous American political families, is running for president. Kennedy, 69, filed a statement of candidacy on Wednesday with the Federal Election Commission. The campaign to challenge President Joe Biden for the Democratic nomination is a long shot, in the vein of that launched by the self-help author Marianne Williamson. Kennedy, a nephew of President John F Kennedy and son of the US attorney general and New York senator Robert F Kennedy, was once a bestselling author and environmental lawyer who worked on issues such as clean...