Time to address cable news, starting at the bottom.

Of course, that’s MSNBC, where Brian Williams is coming aboard to report on “breaking news.” In the offices at 30 Rock, hosts of low-rated prime-time shows (that would be all of them) are nervous.

The afternoon lineup already has been shuffled. Al Sharpton’s sorry-assed 6 p.m. show has been busted down to Sunday mornings. Rev. Race Card told the New York Daily News: “I never wanted to be a weeknight pundit. I wanted to be a Sunday morning newsmaker. I wanted to be Dr. Martin Luther King, not Larry King.”

Will his new show have a laugh track?

MSNBC’s ratings suck largely because it’s the 24/7 headquarters for the talking points of the Democratic National Committee (Notorious D.W.S., chairman). Dissent is not tolerated. Ed Schultz once came out in favor of the proposed Keystone XL pipeline. He quickly had to recant and is now an ex-host.

At the top of the ratings, Fox News gives off a distinct Republican establishment vibe. That became apparent when Trump started rising in the polls.

Fox’s edge on its rivals is that controlled dissent is built in. Every discussion panel includes one member whose role is to give the liberal viewpoint. But stick to the script, or else.

Is the illusion of balance (forget fairness) the difference between mega-millions for the Murdoch family and a place that draws little viewership? This TV stuff may be easier than it looks.

I didn’t forget CNN, but unless there’s a missing airplane or a riot, they are a snoozefest leaning toward commissioning more documentaries. It’s like tuning to The Weather Channel looking for the forecast and finding “The Tornado That Ate Schenectady.”

The Weather Channel and MSNBC are controlled by the same company, Comcast.

Stupid is as stupid does.