Mr. Sanders was met with scorn when he arrived on Capitol Hill in 1990. But in the years since, he has evolved from a gadfly to a reliable team player.
In remarks prepared for delivery Saturday, Mr. Biden is expected to say that his rivals want to dissect his decades-long record, but have ignored the eight years he spent serving the nation’s first black president.
A federal judge in Maryland has given the administration until 2 p.m. Friday to explain how it would proceed after a Supreme Court ruling that rejected its rational to add the question.
Mr. Biden reiterated that Ms. Harris had mischaracterized his position on school busing, prolonging what has been a combative period of the presidential primary.
The president began with a rare call for unity in his 45-minute speech, but mostly spent time recounting the history of the armed forces, planes punctuating his message.