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The Democratic caucus of the United States Senate chooses a conference chairman. The office of conference chairman was created in the early 19th centuryrty. The office of party floor leader was not created until 1920. Since then, the Senate Democratic leader has also held the position of conference chairman.
| Dates | Name | State | Notes |
|---|---|---|---|
| -1877 | John W. Stevenson | Kentucky | |
| 1877-1881 | William Wallace | Pennsylvania | |
| 1881-1885 | George Pendleton | Ohio | |
| 1885-1890 | James Beck | Kentucky | |
| 1890-1898 | Arthur P. Gorman | Maryland | |
| 1898-1899 | David Turpie | Indiana | |
| 1899-1903 | James K. Jones | Arkansas | |
| 1903-1906 | Arthur P. Gorman | Maryland | |
| 1906-1907 | Joseph C. S. Blackburn | Kentucky | |
| 1907-1909 | Charles A. Culberson | Texas | |
| 1909-1911 | Hernando D. Money | Mississippi | |
| 1911-1913 | Thomas S. Martin | Virginia | |
| 1913-1917 | John Worth Kern | Indiana | |
| 1917-1919 | Thomas S. Martin | Virginia | |
| 1920-1923 | Oscar W. Underwood | Alabama | Also Democratic floor leader |
| 1923-1937 | Joseph T. Robinson | Arkansas | Also Democratic floor leader |
| 1937-1949 | Alben W. Barkley | Kentucky | Also Democratic floor leader |
| 1949-1951 | Scott W. Lucas | Illinois | Also Democratic floor leader |
| 1951-1953 | Ernest W. McFarland | Arizona | Also Democratic floor leader |
| 1953-1961 | Lyndon B. Johnson | Texas | Also Democratic floor leader |
| 1961-1977 | Michael Mansfield | Montana | Also Democratic floor leader |
| 1977-1989 | Robert C. Byrd | West Virginia | Also Democratic floor leader |
| 1989-1995 | George J. Mitchell | Maine | Also Democratic floor leader |
| 1995-present | Thomas A. Daschle | South Dakota | Also Democratic floor leader |