Opponents take aim at limited health plans

Maybe something isn’t always better than nothing.

Or so went the argument offered by Senator John D. Rockefeller IV, the West Virginia Democrat, in a hearing on Wednesday about a controversial kind of health plan that seems destined to remain on the market for the next several years.

More than a million Americans enrolled in these plans think they have health insurance to protect them from financial catastrophe if they become seriously ill or hurt, Mr. Rockefeller said. “In fact, they don’t,” he said.