United States President Joe Biden may have done right by his party by withdrawing from the presidential race but whether his gesture will significantly improve the Democrats’ chances of retaining the White House in November is still an open question. Visibly frail, he finally heeded growing calls to step down after dallying for 25 days following a disastrous performance against Republican rival Donald Trump in the first presidential debate on June 27, and multiple gaffes at the North Atlantic Treaty Organization’s 75th anniversary summit less than a month later. But he leaves his nominee, Kamala Harris, 59,