Marianne Williamson speaks as she endorses Democratic presidential candidate Sen. Bernie Sanders (I-VT) during a campaign rally at Vic Mathias Shores Park on February 23, 2020 in Austin, Texas. (Photo by Drew Angerer/Getty Images) WASHINGTON (AP) - Self-help author Marianne Williamson, whose 2020 White House campaign featured more quirky calls for spiritual healing than actual voter support, launched another longshot bid for the presidency on Saturday, becoming the first Democrat to formally challenge President Joe Biden for the 2024 nomination."We are upset about this country, we're worried about this country," Williamson told a crowd of more than 600 at a kickoff in the nation's capital. "It is our job to create a vision of justice and love that is so powerful that it will override the forces of hatred and injustice and fear."The 70-year-old onetime spiritual adviser to Oprah Winfrey should provide only token primary opposition — a testament to how strongly national Democrats are united behind Biden.