Republicans on Capitol Hill are challenging an assertion by House leaders that their new health-care package comes in under President Obama's spending limit of $900 billion over the next decade. The true cost of the measure, the GOP argues, is more than $1 trillion. A House leadership aide dismissed the charge as "GOP spin." But, in this case, the spin is essentially true. According to a preliminary estimate by the nonpartisan Congressional Budget Office, expanding coverage to an additional 36 million Americans would cost $1.055 trillion over the next decade under the House plan, counting tax breaks for small businesses,...