Matthew Continetti warns National Review Online readers not to take too much comfort in Bernie Sanders’ likely loss in the Democratic presidential contest.

Don’t write off the socialist revival just yet. Sanders might not win the Democratic nomination. But this outcome does not mean the forces that propelled him to second-place finishes in the two most recent Democratic primaries will vanish overnight. Abandoning the intellectual fight against socialism, both inside and outside the Democratic Party, would cede the field to an increasingly sophisticated and networked band of ideological activists whose influence in media and politics is greater than their numbers. Such ambivalence could have devastating consequences for American society.

The resurgent left has pushed Biden far beyond where he stood as vice president. And a socialist infrastructure guarantees the philosophy’s longevity. Aspiring Democratic politicians must at least deal with, if not pay obeisance to, groups such as the Working Families Party and the Democratic Socialists of America. Especially if they inhabit a deep-blue district ripe for picking by the “Squad.”

Fashionable, lively, radical, and controversial outlets, including Jacobin, Current Affairs, the Young Turks, Chapo Trap House, and Secular Talk, complement popular Instagram and Twitter accounts. And the New York Times magazine’s “1619 Project” shows that the mainstream media is responsive to, and willing to participate in, the latest trends in anti-Americanism.

The most obvious reason not to dismiss the Sanders phenomenon is demographic. On Super Tuesday, Sanders won 30- to 44-year-olds by 18 points, and 18- to 29-year-olds by a staggering 43 points. He defeated Biden by nine points among Hispanic voters and by 25 points among Asian voters. Asian Americans are the fastest-growing ethnic group in the country. Hispanics are second.