A federal judge’s ruling declaring the entire Affordable Care Act invalid came under harsh attack Saturday from legal analysts who predicted higher courts will reject the rationale as a tortured effort to rewrite not just the law but congressional history. 

The ruling in Texas came on the eve of Saturday’s deadline for Americans to sign up for coverage in the federal insurance exchange created by the ACA, more commonly called Obamacare. The judge did not issue any injunction in the case, meaning that in the short term, nothing will change in health-care services or insurance while the courts consider the issue.

The 55-page ruling late Friday from U.S. District Judge Reed O’Connor found the law invalid on the basis of the political and legal history of a few key provisions. O’Connor decided that once Congress repealed the tax penalty that enforced a mandate that most Americans get health insurance, the whole law became invalid.

In any normal election year, we’d compare the two presidential candidates side by side on the issues. But this is not a normal election year. A comparison like that would be an empty exercise in a race where one candidate — our choice, Hillary Clinton — has a record of service and a raft of pragmatic ideas, and the other, Donald Trump, discloses nothing concrete about himself or his plans while promising the moon and offering the stars on layaway. (We will explain in a subsequent editorial why we believe Mr. Trump to be the worst nominee put forward by a major party in modern American history.)

But this endorsement would also be an empty exercise if it merely affirmed the choice of Clinton supporters. We’re aiming instead to persuade those of you who are hesitating to vote for Mrs. Clinton — because you are reluctant to vote for a Democrat, or for another Clinton, or for a candidate who might appear, on the surface, not to offer change from an establishment that seems indifferent and a political system that seems broken.

Running down the other guy won’t suffice to make that argument. The best case for Hillary Clinton cannot be, and is not, that she isn’t Donald Trump.