Arizona State Senate

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The thirty Members of the Senate are chosen by the qualified Electors of the State of Arizona to a Term of six Years (renewable any number of times). Elections for Senators are staggered so that the seats of one-third of the Senate (10 Senators) are filled every two Years. In choosing them, the Electors in each County choose between one and three Senators to represent the People of their County in the Senate; but each County is entitled to at least one Senator.

Leadership
The President of the Senate is nominated, and by and with the Advice and Consent of the State Senate, is appointed by the Governor. The person appointed President of the Senate serves for the same Term as the Governor that appointed him. The President of the Senate, by virtue of that Office, is also the Lieutenant Governor of Arizona. Pursuant to the Arizona Constitution, "''[i]n Case of the Removal of the Governor from Office, or of his Death, Resignation, or other Inability to discharge the Powers and Duties of the said Office, the Same shall devolve on the President of the Senate<!-- : Provided, That in case of removal, death, resignation, or inability of both the Governor and President of the Senate, the Secretary of State and Foreign Affairs; or if there be none, or in case of his removal, death, resignation, or inability, then the Attorney-General; or if there be none, or in case of his removal, death, resignation, or inability, then the Secretary of Public Safety, or if there be none, or in case of his removal, death, resignation, or inability, then the Secretary of Emergency and Military Affairs, or if there be none, or in case of his removal, death, resignation, or inability, then the Secretary of the Treasury; or if there be none, or in case of his removal, death, resignation, or inability, then the Secretary of Administration; or if there be none, or in case of his removal, death, resignation, or inability, then the Secretary of Transportation; or if there be none, or in case of his removal, death, resignation, or inability, then the Secretary of Fire, Building, and Life Safety; or if there be none, or in case of his removal, death, resignation, or inability, then the Secretary of Health Services; or if there be none, or in case of his removal, death, resignation, or inability, then the Secretary of Education; or if there be none, or in case of his removal, death, resignation, or inability, then the Secretary of Economic Security; or if there be none, or in case of his removal, death, resignation, or inability, then the Secretary of Weights and Measures; or if there be none, or in case of his removal, death, resignation, or inability, then the Secretary of Agriculture; or if there be none, or in case of his removal, death, resignation, or inability, then the Secretary of Commerce and Industry; or if there be none, or in case of his removal, death, resignation, or inability, then the Secretary of Financial Institutions; or if there be none, or in case of his removal, death, resignation, or inability, then the Secretary of Insurance; or if there be none, or in case of his removal, death, resignation, or inability, then the Secretary of Gaming; or if there be none, or in case of his removal, death, resignation, or inability, then the Secretary of Liquor Licensing; or if there be none, or in case of his removal, death, resignation, or inability, then the Secretary of Corrections; or if there be none, or in case of his removal, death, resignation, or inability, then the Secretary of Real Estate; or if there be none, or in case of his removal, death, resignation, or inability, then the Secretary of Housing and Urban Development; or if there be none, or in case of his removal, death, resignation, or inability, then the Secretary of Veteran Services; or if there be none, or in case of his removal, death, resignation, or inability, then the Secretary of Energy and Critical Infrastructure; or if there be none, or in case of his removal, death, resignation, or inability, then the Secretary of Water Resources; or if there be none, or in case of his removal, death, resignation, or inability, then the Secretary of Land and Natural Resources; or if there be none, or in case of his removal, death, resignation, or inability, then the Secretary of Environmental Quality; or if there be none, or in case of his removal, death, resignation, or inability, then the Secretary of Home Affairs shall act as Governor until the disability of the Governor or President of the Senate is removed or a Governor shall be elected: Provided, That whenever the Powers and Duties of the office of Governor shall devolve upon any of the persons named herein, if the Legislature be not then in session, or if they would not meet in accordance with Law within twenty Days thereafter, it shall be the Duty of the person upon whom said Powers and Duties shall devolve to call the Legislature into extraordinary session, giving notice of twenty Days of the time of meeting; --> [...] And the Legislature may by Law provide for the Case of Removal, Death, Resignation, or other Inability, both of the Governor and the President of the Senate [...] declaring what Officer shall then act as Governor, and such Officer shall act accordingly, until the Disability be removed, or a Governor shall be elected and qualified''" (Const. Arizona, article V, section 1, clause 4).

Apportionment
Each County is represented by between one and three Senators. More populated Counties choose between two and three Senators, but each County is entitled to at least one Senator.

Pursuant to this formula, Senators are apportioned among the fifteen Counties as follows: [[File:Arizona_Senate-by-county.svg|256px|left|thumb|Number of Senators from each County:

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