ex officio
It is Latin and literally means "from the office". It is part of the political expression: "Ex officio member" which refers to a member of a body (a board, committee, council, etc.) who is part of it by virtue of holding another office.
By virtue of holding a particular office or position; "by right of office". For example, you might be required to select a member of one board from the members of another board, making that member's selection ex officio, as he or she would not have been selected otherwise.
an incumbent
The person currently holding a particular office is the incumbent.
A senate
A Latin phrase which literally means 'by or through position (or, office),' 'ex officio' refers to a position, title, or benefit gained through holding another position of some kind. Thus an 'ex officio board member' is a person who is a board member (of some organization) because of another position or title (etc.) held by that person.
civil office Article I, Section 6, Clause 2
While in Congress, members are forbidden from holding any civil office under the authority of the United States which was created or the emoluments of that office were increased during the time the person was in Congress and no person holding any office under the United States shall be a member of either House during his continuance in office. In plain language, a member of Congress cannot hold any other office within the other two branches of government nor can an employee of one of the other branches of government become a Congressman and stay employed in those other branches.
Not during the Senator's term in office. Article I, s. 6 of the United States Constitution provides as follows: "...no Person holding any Office under the United States, shall be a Member of either House during his Continuance in Office." Once the Senator leaves office, of course, s/he is entitled to hold any office to which s/he is otherwise eligible.
A person holding a public office requiring election getting there is called a politician.
The Administrative Assistant runs the lawmaker's office. they are also called AA
While in Congress, members are forbidden from holding any civil office under the authority of the United States which was created or the emoluments of that office were increased during the time the person was in Congress and no person holding any office under the United States shall be a member of either House during his continuance in office. In plain language, a member of Congress cannot hold any other office within the other two branches of government nor can an employee of one of the other branches of government become a Congressman and stay employed in those other branches.