Members of each political party convene in private meetings known as party conferences (or party caucuses) to elect floor leaders, make committee assignments, and set legislative agendas. Each party elects a conference secretary, who is responsible for keeping the minutes. The party conferences first began electing a secretary in the 1890s, but a lack of surviving minutes of conference meetings makes it difficult to identify who held the positions prior to 1903 for the Democrats and 1911 for the Republicans.
| Senator | Term |
|---|---|
| Charles Curtis (R-KS) |
|
| William S. Kenyon (R-IA) |
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| James W. Wadsworth, Jr. (R-NY) |
|
| Frederick Hale (R-ME) |
|
| Wallace H. White, Jr. (R-ME) |
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| Harold H. Burton (R-OH) |
|
| Chan Gurney (R-SD) |
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| Milton R. Young (R-ND) |
|
| Norris H. Cotton (R-NH) |
|
| Wallace F. Bennett (R-UT) |
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| Robert T. Stafford (R-VT) |
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| Clifford P. Hansen (R-WY) |
|
| E. Jacob Garn (Jake) (R-UT) |
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| Thad Cochran (R-MS) |
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| Robert W. Kasten, Jr. (R-WI) |
|
| Trent Lott (R-MS) |
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| Connie Mack III (R-FL) |
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| Paul Coverdell (R-GA) |
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| Kay Bailey Hutchison (R-TX) |
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| John Cornyn (R-TX) |
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| John Thune (R-SD) |
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| Lisa Murkowski (R-AK) |
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| John Barrasso (R-WY) |
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| Roy Blunt (R-MO) |
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| Joni Ernst (R-IA) |
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| Shelley Moore Capito (R-WV) |
|
| Senator | Term |
|---|---|
| Edward W. Carmack (D-TN) |
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| Robert L. Owen (D-OK) |
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| William E. Chilton (D-WV) |
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| Willard Saulsbury, Jr. (D-DE) |
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| Key Pittman (D-NV) |
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| William H. King (D-UT) |
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| Hugo L. Black (D-AL) |
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| Joshua B. Lee (D-OK) |
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| Francis T. Maloney (D-CT) |
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| Brien McMahon (D-CT) |
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| Thomas C. Hennings, Jr. (D-MO) |
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| George A. Smathers (D-FL) |
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| Robert C. Byrd (D-WV) |
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| Frank E. Moss (Ted) (D-UT) |
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| Daniel K. Inouye (D-HI) |
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| David H. Pryor (D-AR) |
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| Barbara A. Mikulski (D-MD) |
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| Debbie Stabenow (D-MI) |
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| Patty Murray (D-WA) |
|
| Tammy Baldwin (D-WI) |
|
