There will be no more flip jokes about her private email server. There will be no rope lines to wall off crowds, which added to an impression of aloofness. And there will be new efforts to bring spontaneity to a candidacy that sometimes seems wooden and overly cautious.
Hillary Rodham Clinton declared her campaign for president nearly five months ago, before the startling rise of Senator Bernie Sanders, the volcanic candidacy of Donald J. Trump and the very public exploration of another White House run by Vice President Joseph R. Biden Jr.