Some of the biggest ski resorts anywhere lie in U.S. Rep. Jared Polis' Colorado district, dotting the peaks of Summit and Eagle counties, about a hundred miles west of Denver. The area has a high rate of uninsured people and also, it turns out, health plans that are much more expensive than similar plans in surrounding regions. So expensive that Polis, a Democrat, has asked the federal government to exempt some of his constituents from the requirement to buy health insurance.