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Mary Loretta Landrieu is an American politician and former U.S. Senator from the state of Louisiana. She is a member of the Democratic Party.

Mary Landrieu Senate portrait.jpg
United States Senator
from Louisiana
In office
January 3, 1997 – January 3, 2015
Preceded by Bennett Johnston
Succeeded by Bill Cassidy
Chairman of the Senate Energy Committee
In office
February 12, 2014 – January 3, 2015
Preceded by Ron Wyden
Succeeded by Lisa Murkowski
Chairman of the Senate Small Business Committee
In office
January 3, 2009 – February 12, 2014
Preceded by John Kerry
Succeeded by Maria Cantwell
Treasurer of Louisiana
In office
January 1, 1988 – January 8, 1996
Governor Buddy Roemer
Edwin Edwards
Preceded by Mary Evelyn Parker
Succeeded by Ken Duncan
Member of the Louisiana House of Representatives
from the 89th district
In office
January 12, 1979 – December 31, 1987
Personal details
Born Mary Loretta Landrieu
(1955-11-23) November 23, 1955 (age 61)
Arlington, Virginia, U.S.
Political party Democratic
Spouse(s) Frank Snellings
Children 2
Alma mater Louisiana State University, Baton Rouge
Religion Roman Catholicism

Mary Loretta Landrieu (/ˈlændr/ LAN-drew; born November 23, 1955) is an American politician and former U.S. Senator from the state of Louisiana. She is a member of the Democratic Party.

Born in Arlington, Virginia, Landrieu was raised in New Orleans, Louisiana. She is the daughter of Moon Landrieu, former New Orleans mayor and Secretary of the United States Department of Housing and Urban Development, and the sister of Mitch Landrieu, the current Mayor of New Orleans and former Lieutenant Governor of Louisiana. She received her baccalaureate degree from Louisiana State University in Baton Rouge. After working as a real estate agent for several years, she was elected as a state representative (1980–1988) and state treasurer (1988–1996). She won a close race for the U.S. Senate in 1996; she was re-elected by increasing margins in competitive races in 2002 and 2008, but lost in 2014.

Landrieu came to national attention in the wake of Hurricane Katrina in 2005 after she publicly criticized the federal response to the natural disaster. Her opposition to the public option played a major role in the crafting of the 2010 Patient Protection and Affordable Care Act, as she did not agree to support it until additional concessions were granted to support Louisiana's Medicaid system. In 2011, she became a cardinal (chair) of the Senate's Homeland Security Appropriations Subcommittee. She chaired the Senate Committee on Small Business and Entrepreneurship from 2009 to 2014, and chaired the Senate Committee on Energy and Natural Resources from 2014 to 2015.