|U.S. Senior Senator, Louisiana|
| Assumed office (class 2) |
January 7, 1997
|Preceded by||J. Bennett Johnston|
|Born||November 23, 1955|
Mary Loretta Landrieu (born November 23, 1955) is the Senior Democratic United States Senator from the state of Louisiana, as well as the first, and as of 2008, only woman from that state to be elected to the Senate. She is the daughter of former New Orleans mayor Moon Landrieu and the sister of current Louisiana Lieutenant Governor Mitch Landrieu. By national standards, Landrieu is one of the more conservative Democrats in the U.S. Senate. She is a member of the New Democrat Coalition.
Landrieu was born in Arlington, Virginia to Verna Satterlee and former New Orleans mayor Maurice Edwin Landrieu, and raised in New Orleans, Louisiana. She was raised as a Roman Catholic and attended Ursuline Academy of New Orleans. She graduated from Louisiana State University in Baton Rouge in 1977 where she was a member of Delta Gamma sorority. She was a member of the Louisiana House of Representatives from 1980 to 1988. She then served as Louisiana state treasurer from 1988 to 1996.
Landrieu was elected to the U.S. Senate seat previously held by John Bennett Johnston, Jr., in 1996. She defeated the Republican candidate Woody Jenkins of Baton Rouge by 5,788 votes out of 1.7 million cast, the narrowest national result of the 33 races for the U.S. Senate that year and one of the closest election margins in Louisiana history.
On May 23, 2005, Landrieu was among the Gang of 14, the group of moderate senators who forged a compromise on the use of the judicial filibuster and blocked the Republican leadership's attempt to implement the so-called nuclear option over the organized filibustering by Senate Democrats of judicial nominees in the U.S. Senate.
Hurricane Katrina destroyed Landrieu's lakeside New Orleans home. The senator has become a national spokeswoman for victims of the hurricane and has complained of "the staggering incompetence of the national government." 
- Senate Committee on Energy and Natural Resources
- Senate Committee on Small Business and Entrepreneurship
- Executive Branch
- Judicial Branch
- Legislative Branch
Counties: Acadia, Allen, Ascension, Assumption, Avoyelles, Beauregard , Bienville, Bossier, Caddo, Calcasieu, Caldwell, Cameron, Catahoula, Claiborne, Concordia, DeSoto, East Baton Rouge, East Carroll, East Feliciana, Evangeline, Franklin, Grant, Iberia, Iberville Parish, Jackson, Jefferson Davis, Jefferson, Lafayette, Lafourche, LaSalle, Lincoln, Livingston, Madison, Morehouse, Natchitoches, Orleans, Ouachita, Plaquemines, Pointe Coupee, Rapides, Red River, Richland, Sabine, St. Bernard, St. Charles, St. Helena, St. James, St. John The Baptist, St. Landry, St. Martin, St. Mary, St. Tammany, Tangipahoa, Tensas, Terrebonne, Union, Vermilion, Vernon, Washington, Webster, West Baton Rouge, West Carroll, West Feliciana, Winn