Pelosi had some significant involvment- if only that of persuasion

From the NYTimes: In a formidable display of her enduring clout, she helped persuade the incumbent president to abandon his re-election bid to give her party a better chance of holding the White House in November.

Ms. Pelosi after a vote on an article of impeachment against President Donald J. Trump in January 2021.Credit...Anna Moneymaker for The New York Times

Ms. Pelosi plays down her role in nudging Mr. Biden aside and insists the decision was his alone to make. In her focus on polls and fund-raising and in private conversations with the president and rattled Democratic colleagues, she said, she was driven by the single imperative of beating Mr. Trump.

The former speaker said she did not initiate calls with colleagues, trying to dispel claims that she had orchestrated the ouster of Mr. Biden, a longtime ally. But if Democrats triumph this fall after staring down the prospect of a resounding defeat, the maneuvering by Ms. Pelosi — along with personal appeals to Mr. Biden from the Democratic congressional leaders Senator Chuck Schumer and Representative Hakeem Jeffries, both of New York — may turn out to be among her most significant acts.