evidence: After Biden exited the election July 21, the president threw his support behind Harris, a change that altered dynamics in what surveys show is a very tight race. [...] Independent presidential candidate Robert F. Kennedy Jr. talks during a campaign event, in West Hollywood, Calif., June 27, 2024. (AP) [...] Independent presidential candidate Robert F. Kennedy Jr. speaks to supporters during a campaign event April 21, 2024, in Royal Oak, Mich. (AP)