A political novice who calls herself a “democratic socialist” wins an unexpected Democratic Party primary victory, and now political taxonomists are racing to explain just what the term means. Here’s my definition: political hemlock for the Democratic Party.

I write, of course, of Alexandria Ocasio-Cortez. She’s the onetime Bernie Sanders organizer whose victory last month over long-term New York congressman and party boss Joe Crowley is being compared to Tea Partyer Dave Brat’s 2014 primary defeat of the Republican House majority leader, Eric Cantor — a sign of what’s to come, both for the Democratic Party and the country at large.

Well, maybe. It wasn’t long ago — March — that Marine reservist and former federal prosecutor Conor Lamb was feted as the Democratic future for winning a House seat in a Pennsylvania district that Donald Trump had carried by 20 points. The shared secret of Lamb’s and Ocasio-Cortez’s success is that they ran energetic campaigns, reflected the values of the people they sought to represent, and faced lackluster or entitled opponents.

Not every political contest is a battle of ideas. Sometimes it’s just a matter of showing up.

Still, it should be said: “Democratic socialism” is awful as a slogan and catastrophic as a policy. And “social democracy” — a term that better fits the belief of more ordinary liberals who want, say, Medicare for all — is a politically dying force. Democrats who aren’t yet sick of all their losing should feel free to embrace them both.