Mitt Romney, so long bedeviled by the politics of health care, may be about to make another serious mistake.

He is on the verge of spelling out a plan to replace President Barack Obama’s health plan. Romney’s advisers, both inside and outside the formal campaign, want the main component of his alternative to be a change in the tax code’s treatment of health care. But there are two versions on the table, and Romney is leaning toward the one that would offer much less help to the uninsured.

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