Isn't Scott Brown being terribly selfish?

When Mitt Romney was governor he ped a State Health Care plan that is very similar to the one the United States Senate has ped in an effort to improve our national health care. Mitt Romney's state health care plan has been almost a model for formulating the federal plan. Now Scott Brown who is running for an open senate seat says if he is elected he will see the federal health care plan is killed. Why would he deny to the rest of the United States what his state has been providing their citizens? Did he fight against the bill when Romney was putting it into effect? Has he or his family never benefited from the state plan?