DETROIT, March 5: Joe Biden’s presidential campaign spent the past month on the verge of collapse after disappointing finishes in the overwhelmingly white states that launched the Democratic primary. As he watched the turmoil unfold from Gadsden, Alabama, Robert Avery thought the race would change dramatically when it moved into the South.

WASHINGTON, March 27: In 2016, President Donald Trump compared Hillary Clinton’s campaign to the lumbering federal bureaucracy. Now he’s building one of his own.