If You Like ObamaCare . . .

Practically the entire pack of 2020 Democratic presidential wannabes has now jumped aboard the push for “single payer” health care — but none of them is talking about the cost.

Single payer, in essence, is ObamaCare on steroids: It makes Uncle Sam the health insurer for everyone, for “free” — which has been the left’s dream for decades.

On Wednesday, Sen. Bernie Sanders plans to roll out his Medicare for All bill. Already signed on to the Vermont socialist’s plan are Democratic Sens. Elizabeth Warren (Mass.), Kamala Harris (Calif.) and Cory Booker (NJ), among others.

Support is looking like it’ll be a litmus test in 2020: A recent Gallup poll that found 63 percent of Democrats back “governmentrun” health care.

In fact, ObamaCare was just the best the left could pass — a stepping-stone toward their ultimate goal. (Maybe that’s why they never bothered to make sure it actually worked.) And never mind that, where the ObamaCare law “only” canceled the policies of 7 mil- lion or so people, single-payer would kill the employer-provided coverage that 165 million Americans are pretty happy with.

Or that “free health care for all” isn’t really free. Medicare for All would cost trillions, hand control over medical decisions to bureaucrats and erode care.

Colorado voters nixed a similar idea last year by a whopping 79-21 margin. California lawmakers shelved their single-payer bill after seeing the sticker price.

Heck, even Sanders’ own state figured out single-payer was unaffordable: Vermont’s governor ditched it in 2014 after realizing the state would have to double its tax revenue to pay for it.

Even after Democrats raided Medicare to help fund ObamaCare, it eats up 15 percent of the federal budget and is on track to go broke by 2029. To pay for their dream, would Dems raise tax rates to, say, 50, 70, 90 percent — and tank the economy?

Republicans should demand the Congressional Budget Office tally the costs of Sanders’ bill — then force the Democrats to vote on it.