WASHINGTON >> 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.

“I, as of today, am a candidate for the office of president of the United States,” she said in a campaign kickoff in the nation’s capital.

The 70-year-old onetime spiritual adviser to Oprah Winfrey will almost certainly provide only token primary opposition — a testament to how strongly national Democrats are united behind Biden. Still, she tweaked the president, a longtime Amtrak rider, by holding her opening rally at the presidential suite at Union Station, Washington’s railway hub.

Biden gave his own speech from Union Station, close to the Capitol, just before last November’s elections, when he led Democrats to a surprisingly strong showing, urging voters to reject political extremism and saying “democracy itself” was at stake.

Williamson, whose red, blue and black campaign signs feature the dual slogans “A New Beginning,” and “Disrupt the System,” plans to campaign in early-voting states on the 2024 election calendar, including New Hampshire, which has threatened to defy a Biden-backed plan by the Democratic National Committee to have South Carolina lead off the nominating contests.

Democrats and Republicans in New Hampshire have warned that if Biden skips the state’s unsanctioned primary and a rival wins it, that outcome could prove embarrassing for the sitting president — even if that challenger has no real shot of actually being the nominee.

“You can appreciate what the president has done, defeating the Republicans in 2020, and still feel that it is time to move on,” Williamson said in a recent interview with “Good Morning New Hampshire.”