Why wasn’t Bill Clinton believed back in the 1990s? Could it have had anything to do with that time he looked into the camera, wagged his finger at the American people, and told them, “I did not have sexual relations with that woman, Miss Lewinsky?”

Nope. That wasn’t it. People didn’t believe honest ol’ Bill because of “polarization . . . just because of the party.” That was the view expressed on CNN this morning by network commentator Errol Louis. His comment came during a discussion of President Trump’s latest poll ratings on credibility.

CHRIS CUOMO: You have eight-in-ten Republicans say they still back the President. Which you should get. You should get the home team. Eighty, ninety per cent not uncommon. But if only half of them believe you, how do you make sense of it?

ERROL LOUIS: This is the Trump effect. We watched it all the way through the campaign. You ask people: do you believe what this man is saying? No. Do you support him? Yes. This is in some ways an indication of the kind of partisanship we’ve seen going on, the polarization of the country. It’s interesting that he falls only below Bill Clinton.

Because Bill Clinton in the early ’90s was the start of what we now know as the modern era of polarization, where people just because of the party, just because they’re never going to believe anything the guy says or like anything that he wants to do, are going to oppose him.”

This kind of blatant disregard for reality is why people don’t believe . . . CNN.

Note: If people didn’t believe Clinton just because of polarization, did Louis really mean to admit that liberals today don’t believe Trump because he’s a Republican? And note this blooper by Louis: he said that when it comes to credibility ratings, Trump “falls only below Clinton.” That would suggest that Clinton is the highest-rated president on credibility, and Trump is second. In fact, Trump comes in last, behind Clinton who is in second-to-last place.

Note segundo: Louis was preceded by another CNN commentator, John Avlon. Never one for understatement, Avlon called Trump’s low credibility ratings “a national tragedy” for which he’s responsible.