President Pro Tempore

The President Pro Tempore is the elected leader of the Senate, conducting all meetings of the chambers when the Vice President is absent. The President Pro Tempore is elected at the beginning of every Congressional Session so it may swear in the new members of the Senate.
As of current there has been 6 President Pro Tempores; 2 Constitutional Democrats, 2 Federalists, 1 Democratic-Republican, and 1 Democratic Union.
The most time served as President Pro Tempore is by George Benckendorf, who served 5 terms at a whopping 2,620 days in office.
The youngest President Pro Tempore was Charles Benckendorf, who took the office at 37 years and 200 days old; conversely the oldest President Pro Tempore is Gouverneur Morris who is 49 years +.
==Speaker Firsts==
#First President Pro Tempore was Thomas Jefferson.
#The longest-serving President Pro Tempore was George Benckendorf at 2,620 days.
#The shortest-serving President Pro Tempore was John Rutherford at 218 days.
==List of President Pro Tempores==
United States President Pro Tempores
Presidency	Presidency	President Pro Tempore	President Pro Tempore	Prior office 	Party	Party 	Term(s)
1 	April 1, 1789
-
April 19, 1790	 	
===Thomas Jefferson===	Governor of Virginia 	 	Democratic-Republican 	1st
2 	April 19, 1790
-
March 4, 1795	 	
===George Benckendorf===	Senator from Pennsylvania 	 	Constitutional Democratic	1st
2 	April 19, 1790
-
March 4, 1795	 	
===George Benckendorf===	Senator from Pennsylvania 	 	Constitutional Democratic	2nd
2 	April 19, 1790
-
March 4, 1795	 	
===George Benckendorf===	Senator from Pennsylvania 	 	Constitutional Democratic	3rd
3 	March 4, 1795
-
November 16, 1796	 	
===Charles Benckendorf===	Senator from New Hampshire 	 	Constitutional Democratic	1st
4 	November 16, 1796
-
March 4, 1799	 	
===George Benckendorf===	Former President Pro Tempore 	 	Constitutional Democratic	4th
4 	November 16, 1796
-
March 4, 1799	 	
===George Benckendorf===	Former President Pro Tempore 	 	Constitutional Democratic	5th
5 	March 4, 1799
-
April 7, 1800	 	
===Theodore Foster===	Senator of Rhode Island 	 	Federalist 	1st
6 	July 30, 1800
-
March 4, 1801	 	
===John Rutherford===	Senator from New Jersey 	 	Democratic Union 	1st
7 	March 4, 1801
-
June 29, 1802	 	
===Gouverneur Morris===	Former United States Minister to France	 	Federalist 	1st
8 	June 29, 1802
-
March 4, 1803	 	
=== William Aubrey ===	Representative from New York 	 	Democratic Union 	1st
9 	March 4, 1803
-
March 4, 1805	 	
=== Aaron Ogden === 	Representative from New Jersey 	 	Constitutional Democratic	1st
10 	March 4, 1805
-
March 4, 1807	 	
=== William Aubrey ===	Former President Pro Tempore 	 	People's Labour 	2nd
11 	March 4, 1807
-
March 4, 1809	 	
===John Quincy Adams===	Senator from Massachusetts 	 	Yankee 	1st
12 	March 4, 1809
-
March 4, 1811	 	
===Theophile Lybaert===	Senator from New York 	 	Constitutional Democratic	1st
13 	March 4, 1811
-
March 4, 1813	 	
===Andrew Gregg=== 	Senator from Pennsylvania 	 	Democratic-Republican 	1st
14 	March 4, 1813
-
March 8, 1817	 	
===William Aubrey===	Former President Pro Tempore 	 	People's Labour 	3rd
14 	March 4, 1813
-
March 8, 1817	 	
===William Aubrey===	Former President Pro Tempore 	 	Democratic 	4th
14 	March 4, 1813
-
March 8, 1817	 	
===William Aubrey===	Former President Pro Tempore 	 	Democratic 	5th
15 	March 8, 1817
-
March 4, 1819	 	
===James Madison=== 	Senator from Virginia 	 	Democatic 	1st
16 	March 4, 1819
-
March 4, 1821	 	
===Joseph Gus=== 	Senator from Maryland 	 	Republican 	1st
17 	March 4, 1821
-
March 4, 1823	 	
===James J. Wilson===	Senator from New Jersey 	 	Democratic 	1st
18 	March 4, 1823
-
Present	 	
===Joseph Gus=== 	Former President Pro Tempore 	 	Republican 	2nd