Robert F. Kennedy Jr, son of former Democratic Attorney General "Bobby" Kennedy, is running for president.
Polls give him 10% for the November presidential elections and that hurts Joe Biden more than Donald Trump. Democrats have gone on the offensive, with mobile billboards near places where RFK Jr holds rallies and legal action to keep him off the ballot. Kennedy's popularity, around 10% in polls, complicates the Biden campaign strategy, which seeks to turn the November vote into an election between him and Trump.