This isn’t to diminish the importance of states in our federal system. To the contrary, that system recognizes that every American enjoys a kind of dual citizenship. You are a citizen of the United States and you are, in a sense, a citizen of your state. When you vote for your governor, or your local and state lawmakers, or your senators and members of Congress, you are voting as a citizen of your state. When you vote for the president—the only person whose job it is to represent all Americans equally—you should be voting as a citizen of the United States.