WashPo just broke the allegations against Roy Moore. Before, they did Pulitzer Prize-winning investigations into the Presidents' foundation, and how it channeled donations into his businesses.

The NYT has had dozens of investigative reports in the last year. They were, for example, the first to reveal the meeting of the President's son and advisors with the underbelly of Russian politics. I think they also broke the allegations against Al Franken.

The wire services do valuable work, but they don't investigate. They are a mechanism to lower the costs of journalism by de-duplicating the manpower needed to, for example, attend press conferences. That approach is important, especially in times of financial pressures on journalism. But it doesn't suffice for the fourth estate to fulfil its duty to inform the public.