The whole of the house has terms of 2 years and they all come up for election at the same time.
From the Constitution, the Senators are elected by the people and not by the legislatures of the states, That was changed some years ago.
Section 2
1: The House of Representatives shall be composed of Members chosen every second Year by the People of the several States, and the Electors in each State shall have the Qualifications requisite for Electors of the most numerous Branch of the State Legislature.
Section 3
1: The Senate of the United States shall be composed of two Senators from each State, chosen by the Legislature thereof,3 for six Years; and each Senator shall have one Vote.
2: Immediately after they shall be assembled in Consequence of the first Election, they shall be divided as equally as may be into three Classes. The Seats of the Senators of the first Class shall be vacated at the Expiration of the second Year, of the second Class at the Expiration of the fourth Year, and of the third Class at the Expiration of the sixth Year, so that one third may be chosen every second Year; and if Vacancies happen by Resignation, or otherwise, during the Recess of the Legislature of any State, the Executive thereof may make temporary Appointments until the next Meeting of the Legislature, which shall then fill such Vacancies.4
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