Daniel Henninger‘s latest Wall Street Journal column explains the long-term political significance of ObamaCare’s success or failure.

As its Oct. 1 implementation date arrives, ObamaCare is the biggest bet that American liberalism has made in 80 years on its foundational beliefs. This thing called “ObamaCare” carries on its back all the justifications, hopes and dreams of the entitlement state. The chance is at hand to let its political underpinnings collapse, perhaps permanently.

If ObamaCare fails, or seriously falters, the entitlement state will suffer a historic loss of credibility with the American people. It will finally be vulnerable to challenge and fundamental change. But no mere congressional vote can achieve that. Only the American people can kill ObamaCare.

No matter what Sen. Ted Cruz and his allies do, ObamaCare won’t die. It would return another day in some other incarnation. The Democrats would argue, rightly, that the ideas inside ObamaCare weren’t defeated. What the Democrats would lose is a vote in Congress, nothing more.

A political idea, once it becomes a national program, achieves legitimacy with the public. Over time, that legitimacy deepens. So it has been with the idea of national social insurance. …

… An established political idea is like a vampire. Facts, opinions, votes, garlic: Nothing can make it die.

But there is one thing that can kill an established political idea. It will die if the public that embraced it abandons it.

Six months ago, that didn’t seem likely. Now it does.

The public’s dislike of ObamaCare isn’t growing with every new poll for reasons of philosophical attachment to notions of liberty and choice. Fear of ObamaCare is growing because a cascade of news suggests that ObamaCare is an impending catastrophe.