An examination by The Times of the Russian operation — based on interviews with dozens of players targeted in the attack, intelligence officials who investigated it and Obama administration officials who deliberated over the best response — reveals a series of missed signals, slow responses and a continuing underestimation of the seriousness of the cyberattack.
By last summer, Democrats watched in helpless fury as their private emails and confidential documents appeared online day after day — procured by Russian intelligence agents, posted on WikiLeaks and other websites, then eagerly reported on by the American media, including The Times. Mr. Trump gleefully cited many of the purloined emails on the campaign trail.
The fallout included the resignations of Representative Debbie Wasserman Schultz of Florida, the chairwoman of the D.N.C., and most of her top party aides. Leading Democrats were sidelined at the height of the campaign, silenced by revelations of embarrassing emails or consumed by the scramble to deal with the hacking. Though little-noticed by the public, confidential documents taken by the Russian hackers from the D.N.C.’s sister organization, the Democratic Congressional Campaign Committee, turned up in congressional races in a dozen states, tainting some of them with accusations of scandal.