President pro tempore of the United States Senate

The President pro tempore of the United States Senate is one of the highest ranking official in the Senate. The current holder is Republican Charles Grassley.

Deceased

 * Richard Henry Lee (June 19, 1794)
 * Henry Tazewell (January 24, 1799)
 * Samuel Livermore (May 18, 1803)
 * William Bingham (February 7, 1804)
 * Ralph Izard (May 30, 1804)
 * Abraham Baldwin (March 4, 1807)
 * Uriah Tracy (July 19, 1807)
 * William Bradford (July 6, 1808)
 * John Laurance (November 11, 1810)
 * Theodore Sedgwick (January 24, 1813)
 * Jacob Read (July 17, 1816)
 * John Milledge (February 9, 1818)
 * John Langdon (September 18, 1819)
 * Joseph Bradley Varnum (September 21, 1821)
 * Jesse Franklin (August 31, 1823)
 * John Gaillard (February 26, 1826)
 * John Eager Howard (October 12, 1827)
 * Stephen Row Bradley (December 9, 1830)
 * James Hillhouse (December 29, 1832)
 * William Harris Crawford Sr. (September 15, 1834)
 * Andrew Gregg (May 20, 1835)
 * Joseph Inslee Anderson (April 17, 1837)
 * Nathaniel Macon (June 29, 1837)
 * John Brown (August 29, 1837)
 * Samuel Smith (April 22, 1839)
 * Hugh Lawson White (April 10, 1840)
 * James Barbour (June 7, 1842)
 * Samuel Lewis Southard (June 26, 1842)
 * John Pope (July 12, 1845)
 * James Ross (November 27, 1847)
 * Ambrose Hundley Sevier (December 31, 1848)
 * William Rufus DeVane King (April 18, 1853)
 * George Poindexter (September 5, 1853)
 * Littleton Waller Tazewell (May 6, 1860)
 * Willie Person Mangum (September 7, 1861)
 * John Tyler (January 18, 1862)
 * David Rice Atchison (January 26, 1886)