Shadow congressperson

More of a term than a word; shadow congressperson are:

"The offices of shadow U.S. Representative and shadow U.S. Senator are elective offices in the District of Columbia. While the holders of these offices are not seated in either house of the United States Congress, they promote the District's efforts to gain full voting rights. Historically, shadow congressmen were elected by organized incorporated territories prior to their admission to the Union.[1] The name was based on the traditional practice of the Official Opposition appointing shadow cabinets in parliamentary systems.[citation needed]"

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