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Updated December 1, 2022

U.S. Senate Vacancies: How Are They Filled?

Senate Vacancies in the Constitution and
State Law
Vacancies in the membership of the U.S. Senate can occur
as the result of the resignation, death, or expulsion of a
Member, or the refusal of the Senate to seat a Senator-elect.
Article I, Section 3, clause 2 of the Constitution originally
vested the power of appointment to fill Senate vacancies
exclusively with the state governors when the legislatures
were in recess, with the state legislatures authorized to elect
replacements to serve the balance of the term at their next
session. The Seventeenth Amendment, ratified in 1913,
provided for direct election of Senators and directed
governors to issue writs of election to fill vacancies. It also
authorized state legislatures to empower governors to make
temporary appointments until successors can be elected. At
present, 45 states authorize their governors to appoint a
Senator to fill a vacancy until a replacement is elected. Five
states, however, provide that Senate vacancies may be filled
only by election.
Filling Vacancies by Special Election
Only: Five States
Five states currently require Senate vacancies be to filled
only by special elections; their governors are not
empowered to fill a vacancy by appointment. They are as
follows:

North Dakota
Oklahoma

Oregon
Rhode Island

Wisconsin

Typically, these states provide for an expedited election
process in order to reduce the period during which the seat
is vacant. If the vacancy falls late in the term, the seat is
filled at the regularly scheduled general election.
Filling Vacancies by Gubernatorial
Appoint      ent
Forty-five states authorize their governors to fill Senate
vacancies by appointment.
Filling Vacancies by Gubernatorial
Appointment Through the Next
Statewide General Election: 36 States
Thirty-six of the 45 states that provide for gubernatorial
appointment authorize their governors to select a Senator
who holds the seat until the next regularly scheduled
statewide general election, when a special election is held to
fill the seat for the balance of the term. They are as follows:

Arizona       Illinois

Arkansas
California
Colorado

Indiana
Iowa
Kansas

Montana

Pennsylvania

Nebraska       South Carolina
Nevada         South Dakota
Tennessee

Delaware      Kentucky      New
Florida       Maine         Hampshire
Georgia       Maryland      New Jersey
Hawaii        Michigan      New Mexico
Idaho         Minnesota     New York

Utah
Virginia
West Virginia
Wyoming

Missouri    North
Carolina
Ohio
In several of these states (Hawaii, Minnesota, New Jersey,
New York, and Virginia), if a Senate vacancy occurs close
to a regularly scheduled statewide primary or general
election, the appointed Senator serves until the next
following statewide election.
Same Party Requirements
In addition, seven of the gubernatorial appointment states
listed above require that Senators appointed by the governor
be a member of the same political party as the prior
incumbent. They are as follows:
Arizona, North Carolina, Utah, and Wyoming
The governor appoints a replacement from the same party
as the previous incumbent.
Hawaii and Kentucky
The governor selects a replacement from a list of three
prospective appointees submitted by the political party of
the previous incumbent.
Maryland
The governor appoints a replacement from a list of names
submitted by the state central committee of the political
party of the vacating office holder.
These provisions are intended to ensure that the appointing
governors respect the results of the previous election by
selecting a temporary replacement who will either be of the
same political party as the prior incumbent, or who has
been endorsed or nominated by the prior incumbent's
party apparatus. Some commentators have questioned these
same party requirements, asserting that they add extra
qualifications to Senate membership, beyond the
constitutional requirements of age, citizenship, and
residence.
Filling Vacancies by Gubernatorial
Appointment Followed by an Expedited
Special Election: Nine States
The remaining nine states that provide for gubernatorial
appointment also generally require a stand-alone special
election to fill the seat on an accelerated schedule, rather
than waiting for the next regular statewide election. If the

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