evidence: Kennedy, who left Riverkeeper in 2017, has continued to have a major impact on the environmental movement, helping to bring successful lawsuits against DuPont and Monsanto. In April, a number of his former colleagues at the N.R.D.C., including Adams and Barratt-Brown, signed an open letter calling on him to drop out of the Presidential race: "In nothing more than a vanity candidacy, RFK Jr. has chosen to play the role of election spoiler to the benefit of Donald Trump—the single worst environmental president our country has ever had." Barratt-Brown emphasized the deep sense of personal betrayal that the letter’s signatories felt. "That’s his environmental family," she said. (Kennedy is the godfather to one of Barratt-Brown’s children.) She added that Kennedy’s candidacy has weighed heavily on Adams, who is eighty-eight. "I think he feels the strain of having to speak out that way against somebody he was such a mentor to," Barratt-Brown said. [...] That Sunday, Joe Biden announced that he was withdrawing from the campaign, and he endorsed his Vice-President, Kamala Harris, for President. Early polling suggests that Harris is gaining ground with certain traditionally Democratic voters who were disillusioned with Biden. Kennedy’s numbers are slipping. If the youth vote goes to Harris, Kimball, the pollster, said, "that’s going to hurt him." (Fox Kennedy told me that Kennedy would also be open to offers from a Harris Administration.)