MICHAEL BARONE: Democrats getting out on dangerously left-wing limb.

Support for legal abortion has been a Democratic staple for years, but Democrats have recently moved left to pass laws allowing it up to nine months. They did so successfully in New York and unsuccessfully in Virginia, after Democratic Gov. Ralph Northam suggested it would apply even after birth.

That’s an unpopular position, to say the least. Polls for years have shown majority support for legalizing abortion in the first trimester and prohibiting it in the third. But all six Democratic presidential candidates in the Senate voted against the bill introduced by Sen. Ben Sasse, R-Neb., requiring medical care for babies actually born alive after failed abortions.

Did this extreme position affect public opinion? A February Marist poll showed equal numbers, 47 percent, calling themselves pro-life and pro-choice, a sharp change from January’s 55 to 38 percent pro-choice advantage. Maybe this poll is an outlier, but maybe the sudden placement of the spotlight on ninth-month abortions has actually changed opinion.

An overwhelmingly pro-choice press has long covered for Democrats, refusing to explain that the “health of the mother” exception to abortion bans means (because “health” includes mental health) abortion on demand. Predictably, CNN and MSNBC ignored the Sasse bill vote and media like Politico provided spectacularly biased accounts.

But liberal media doesn’t have a monopoly on megaphones any more, and Trump has shown himself capable of using invective, ridicule, and also serious argument to attack extreme positions, as he did Hillary Clinton’s on abortion. He has no compunction about raging impolitely against what liberals insist is politically correct.

Democratic presidential candidates, perhaps isolated in liberal cocoons, don’t seem to understand their vulnerability on issues like reparations, ninth-month abortions, and the Green New Deal. They assume their media friends can rescue them. But what if they can’t?

“Safe, legal, and rare” was a good general election stance. “Kill babies after birth if the woman doesn’t want to be a mother” not so much.