DeGette and Polis, and all other members of Congress, are not "exempt" from Obamacare. Obamacare isn't a health care plan. It's legislation. If you don't have health care from an employer's plan, then you can sign up on an exchange for a private insurance plan, and possibly receive a public subsidy to defray the cost. Members of Congress had their health insurance through the government plan, just like you have health care through your employer (I am only assuming that's your case, not knowing if that's true).