OUR SOURCE WAS THE NEW YORK TIMES.  In his 2003 book Arrogance: Rescuing America from the Media Elite, Bernard Goldberg wrote:

So let’s get to the root cause of liberal media bias in America.

You guessed it! The New York Times, a paper 99.5 percent of the American people do not read, yet which is still the most influential newspaper in America because the most influential people in America do in fact read it.

So, yes, the New York Times does indeed occupy a unique place in American journalism. And it’s not just because its columns are syndicated to hundreds of local papers around the country. It’s mostly because it sets the agenda for so many other news outlets, especially the networks where most Americans get their world and national news. The fact is, the Big Three news networks wouldn’t know what to put on the air without it. As I’ve said in the past, if the New York Times went on strike tomorrow morning, they’d have to cancel the CBS, NBC, and ABC evening newscasts tomorrow night.

Some exceptions apply, of course:

More here: Bari Weiss faced ‘significant resistance’ from CBS News staffers about Alaska ballot scandal, insiders say.