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President pro tempore of the United States Senate

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    Lewis Cass, Governor, Senator, Secretary of War & State (1782 - 1866)
    CASS, Lewis, (great-great-grandfather of Cass Ballenger), a Senator from Michigan; born in Exeter, N.H., October 9, 1782; attended Exeter Academy; moved with his parents to Wilmington, Del., in 1799 an...
  • Allen G. Thurman, U.S. Senator (1813 - 1895)
    Allen Granberry Thurman (November 13, 1813 – December 12, 1895) was a Democratic Representative and Senator from Ohio, as well as the nominee of the Democratic Party for Vice President of the United ...
  • William Henry King (1862 - 1949)
    William Henry King (June 3, 1863 – November 27, 1949) was an American lawyer, politician, and jurist from Salt Lake City, Utah. A Democrat, he represented Utah in the United States Senate from 1917 u...
  • William Bradford (1720 - 1808)
    ) William Bradford (November 4, 1729 - July 6, 1808) was a physician, lawyer, and United States Senator from Rhode Island. He was born at Plympton, Massachusetts, and was the great-great-grandson o...
  • John Tyler, 10th President of the United States (1790 - 1862)
    John TYLER (10th President of the USA) was born on 29 Mar 1790 in Greenway Plantation, Charles City County, Virginia. He served as as President of the United States from 1841 to 1845. He died on 17 Jan...

President pro tempore of the United States Senate

The President pro tempore (/ˌproʊ ˈtɛmpəriː/ or /ˌproʊ ˈtɛmpəreɪ/), also president pro tem, is the second-highest-ranking official of the United States Senate. The United States Constitution states that the Vice President of the United States is the President of the Senate, despite not being a senator, and that the Senate must choose a president pro tempore. Since 1890, the most senior senator in the majority party has generally been chosen to be president pro tempore; this tradition has been observed without interruption since 1949.

During the Vice President's absence, the president pro tempore is empowered to preside over Senate sessions. In practice, neither the Vice President nor the President pro tempore usually presides; instead, the duty of presiding officer is rotated among junior senators of the majority party to give them experience in parliamentary procedure.

The president pro tempore is third in the line of succession to the presidency, after the Vice President and the Speaker of the House of Representatives.

Following the death of Daniel Inouye on December 17, 2012, Patrick Leahy, a Democrat and senior senator from Vermont, was elected to the position by unanimous consent.

List of Presidents pro tempore of the United States Senate