A
Democrat, Green first ran for political office in 1952 as the Democratic candidate for
Oregon Secretary of State. She was defeated in a close race by incumbent
Earl T. Newbry. In
1954, she was elected as the representative for
Oregon's 3rd congressional district, defeating
Republican nominee (and future
Oregon governor)
Tom McCall. Green was the second woman (after
Nan Wood Honeyman) to be elected to the House from Oregon, and one of only 17 women in the House at the time of her election. the
Higher Education Facilities Act of 1963, which
Lyndon Johnson called "the greatest step forward in the field since the passage of the
Land-Grant Act of 1862", After
Bernice Sandler's work, Green helped to introduce a higher education bill that contained provisions regarding gender equity in education. The hearings on this bill, working together with fellow Representative
Patsy Mink and Senator
Birch Bayh, eventually resulted in the passage of Title IX in 1972. In 1964, she was the only woman in the House of Representatives who voted
against including sex as a protected class in
Title VII of the Civil Rights Act of 1964; the amendment to do so had been introduced by Virginia Congressman
Howard W. Smith in an attempt to sink the bill. In order not to endanger passage of the bill prohibiting discrimination on the basis of race, color, religion, or national origin, Green was willing to forego the inclusion of sex, noting "For every discrimination that I have suffered, the Negro woman has suffered ten times that amount of discrimination." Senator
Mark Hatfield called Green "the most powerful woman ever to serve in the Congress".
Adlai Stevenson selected her to second his nomination at the
1956 Democratic National Convention, John F. Kennedy also selected her to second his nomination at the 1960 Democratic National Convention, and she headed the state primary campaigns for
John F. Kennedy,
Robert F. Kennedy, and
Henry M. "Scoop" Jackson. She declined each time, however, to turn her House seniority for junior status in the Senate. ==After Congress==