2017: Elizabeth Warren became the first woman to serve as vice chair of the Senate Democratic Conference.
1967: Senator Margaret Chase Smith became the first woman to serve as chair of the Senate Republican Conference.
1987: Rep. Mary Rose Oakar (D-OH) became the first woman to serve as vice chair of the House Democratic Caucus.
A Seat at the Table: Congresswomen's Perspectives on Why Their Presence Matters
Book
Analysis
Officeholders
U.S. Congress