Now it’s my turn to weigh in on the “Lie of the Year,” the gimmick PolitiFact uses to highlight the most egregious misstatements of the past year. This time, though, the fact-checking service stumbled into a fusillade of criticism from such unlikely bedfellows as New York Times liberal columnist Paul Krugman and the conservative Wall Street Journal’s online opinion page. The lie, according to PolitiFact, was the Democrats’ assertion that Republicans voted to end Medicare when the House voted last spring to embrace a voucher plan pushed by Wisconsin congressman Paul Ryan. PolitiFact also argued Democrats overreached by failing to tell the public Ryan’s plan would not force people over fifty-five to leave the traditional Medicare program, using words like “end” and “kill” even though the program would continue to exist in a privatized form, and showing videos of old people who would not be affected by the change.

I am not going to comment on PolitiFact’s own politics (as the Wall Street Journal did), the notion of fact-checking balance that interested other commentators, or the notion that PolitiFact’s time has come and gone. The fact is Republicans by supporting Ryan’s voucher plan did essentially vote to end Medicare. The Dems who didn’t like that idea should have been more precise in their statements, saying instead “Republicans voted to end Medicare as we know it” or “voted to end Medicare as a social insurance program”—a point that Norman Ornstein, a resident scholar at the American Enterprise Institute, made in PolitiFact’s critique.

PolitiFact and others should have left it there and devoted space to the larger issue. Medicare may be wildly popular, but it is not well understood by most people—be they beneficiaries, politicians, or journalists. Deconstructing how this complicated and misunderstood program works and the historical context for proposed changes would go a long way to helping the public evaluate the arguments from both Democrats and Republicans. For more than a year, Campaign Desk has urged journalists to fill that void.

PolitiFact got into a bit of historical context, but its presentation was one-sided, saying that, “historically, attacks about Medicare have come from Democrats.” But the site did not trace the origins of the conservative/Republican efforts to transform Medicare into a voucher plan, a la Paul Ryan. A decade ago, in my book Slanting the Story: The Forces that Shape the News, I showed that conservative think tanks and their benefactors had long sought such a change as a way to transfer the increasing costs of seniors’ health care from the federal government to seniors themselves, thus saving money for the federal treasury. Deficit hawks like this approach. During that period, the Heritage Foundation and others decided to educate the press on the virtues of using vouchers for Medicare and modeling the program after the insurance arrangements for federal employees.

There’s no doubt that the voucher plan contemplated by Ryan—and now his new sidekick, Oregon senator Ron Wyden—will eventually change Medicare from a social insurance scheme, where everyone who paid into the program is entitled to a benefit, into private insurance, where the sellers must bow to the profit incentive. Because all people over sixty-five are included in Medicare’s gigantic pool, and risks are spread over more than 40 million seniors, Medicare is able to insure lots of very old and very sick people at reasonable costs. Private insurers cannot do that.

Trudy Lieberman is a fellow at the Center for Advancing Health and a longtime contributing editor to the Columbia Journalism Review. She is the lead writer for The Second Opinion, CJR’s healthcare desk, which is part of our United States Project on the coverage of politics and policy. Follow her on Twitter @Trudy_Lieberman.