The grossly misnamed Patient Protection and Affordable Care Act was such a tough sell in 2010 that 34 House Democrats voted against it. And no Republican in either the House or Senate voted for it.

Later that year, public alarm over “Obamacare” helped return control of the House to the GOP.

The bewildering, costly law is an even tougher sell now.

So it’s no wonder that the administration announced Tuesday a one-year postponement, until the start of 2015, for the law’s requirement that employers of more than 50 full-time workers provide them with health insurance or face fines.

It’s no coincidence that the decision delays the regulation until after the 2014 congressional elections.

The administration had already granted numerous businesses, unions and state and local governments waivers from other aspects of the law.

The politicians who pushed the 2,700-plus-page landmark legislation through Congress obviously made promises that they can’t keep.

That group includes President Barack Obama, who vowed during a 2009 speech to the American Medical Association:

“If you like your health care plan, you’ll be able to keep your health care plan — period.”

The president frequently repeated that far-fetched pledge before the bill passed — and has been frequently reminded of it since then.

Earlier this year, the Congressional Budget Office projected that up to 20 million Americans were likely to lose their employer-provided health coverage due to the Affordable Care Act.

And The Associated Press recently reported: “Many people who buy their own health insurance could get surprises in the mail this fall: cancellation notices because their current policies aren’t up to the basic standards of President Barack Obama’s health care law. They, and some small businesses, will have to find replacement plans — and that has some state insurance officials worried about consumer confusion.”

From the front page of Monday’s Wall Street Journal:

“Healthy consumers could see insurance rates double or even triple when they look for individual coverage under the federal health law later this year, while the premiums paid by sicker people are set to become more affordable.”

That’s according to a Journal analysis of the law’s new health-insurance “exchanges.”

Sure, projections of lower rates for sick people sound like at least one positive step.

Yet the health of a still-shaky U.S. economy would be further jeopardized by inducing a steep overall upward spike in health insurance costs, triggered in part by the law’s mandate that even healthy young Americans have coverage.

The law’s vast expansion of Medicaid eligibility, a shift that South Carolina and some other states are still resisting, is another expensive side-effect.

The Obama administration, anticipating Americans’ growing sticker shock, has enlisted entertainment and sports stars — and even librarians — into another sales mission for what is being increasingly exposed as the unaffordable Affordable Care Act.

The National Football League, though, doesn’t want to play that persuasion game. As Tuesday’s Los Angeles Times reported, Health and Human Services Secretary Kathleen Sebelius said last week that “the NFL was ‘enthusiastically engaged’ in talks about promoting the health-care law. But a spokesman for the NFL doused that idea, saying it currently has ‘no plans to engage in this area.’ ”

At least the administration has punted away the new insurance burden on large employers — for now.

Too bad Congress didn’t make a similar decision to punt Obamacare away when it had a chance.

And regardless of which celebrities agree to tout that utterly unsustainable law this year, only a comedian would now dare to say:

“If you like your health care plan, you’ll be able to keep your health care plan — period.”