President Joe Biden sought once again to quell fears about his age and fitness, following the conclusion of the NATO summit, with a lengthy press conference in which he touted his accomplishments and took open questions from the press, at several times fielding questions about whether he really had the ability to campaign for a second term. Apart from a couple of gaffes, like calling Vice President Kamala Harris “Vice President Trump” in the first answer, Biden largely held it together and gave decisive, clear answers. And he contrasted his own fitness to Trump’s, noting he has been in policy …