IN 1971, President Nixon sought to forestall single-payer national health insurance by proposing an alternative. He wanted to combine a mandate, which would require that employers cover their workers, with a Medicaid-like program for poor families, which all Americans would be able to join by paying sliding-scale premiums based on their income.

Nixon's plan, though never passed, refuses to stay dead. Now Hillary Clinton, John Edwards and Barack Obama all propose Nixon-like reforms. Their plans resemble measures that were passed and then failed in several states over the past two decades.

From "I am not a Health Reform," by David U. Himmelstein and Steffie Woolhandler, professors of medicine at Harvard and the co-founders of Physicians for a National Health Program.