evidence: The announcement, in a three-minute video, comes on the four-year anniversary of when Biden declared for the White House in 2019, promising to heal the "soul of the nation" amid the turbulent presidency of Donald Trump — a goal that has remained elusive. [...] Biden’s announcement is roughly consistent with the timeline followed by then-President Barack Obama, who waited until April 2011 to declare for a second term and didn't hold a reelection rally until May 2012. Trump launched his reelection bid on the day he was sworn in in 2017.