“For deeply sourced, relentlessly reported coverage in the public interest,” the citation from the Pulitzer Prize board begins, “that dramatically furthered the nation’s understanding of Russian interference in the 2016 presidential election and its connections to the Trump campaign, the president-elect’s transition team and his eventual administration.” Except the journalism that the Pulitzers honored — a 2018 National Reporting prize shared by the Washington Post and the New York Times for reporting on Russiagate — did no such thing. It led to a dramatic misunderstanding, suggesting that Donald Trump colluded with Vladimir Putin to help sway the 2016 election —...