Funnel the costliest patients to subsidized “high-risk pools.” Obamacare’s mandates are meant to drive broad participation in the insurance market, so the premiums paid by a broad number of relatively healthy subscribers essentially subsidize care for the sickest. Without the mandates, many healthy Americans won’t buy insurance, forcing insurance companies to either deny coverage to sick customers or hike premiums to unsustainable levels. The GOP plan would solve that problem by establishing state-based “high-risk pools” for the sickest and directing $25 billion in federal support to them over 10 years.