Question: What American politician, who was the first formally designated floor leader in the United States Senate, lived at 2000 G Street in Washington, D.C. from 1914 to 1925?
Context: The Oscar W. Underwood House is a historic house located at 2000 G Street in the Foggy Bottom neighborhood Northwest, Washington, D.C..  It is nationally significant both for its association with Alabama politician Oscar Underwood (1862-1929) who lived here 1914-25, and also as the first long-term home of the Washington College of Law, the nation's first law school founded and run by women.  It was declared a National Historic Landmark in 1976.  The building presently houses a legal aid clinic operated by George Washington University. An upper house, sometimes called a Senate, is one of two chambers of a bicameral legislature (or one of three chambers of a tricameral legislature), the other chamber being the lower house.  The house formally designated as the upper house is usually smaller, and often has more restricted power, than the lower house.  Examples of upper houses in countries include the UK's House of Lords, India's Rajya Sabha, Russia's Federation Council, Ireland's Seanad, Germany's Bundesrat and the United States Senate. Joseph M. Neal, Jr. (born July 28, 1935), was an American politician who was a Democratic member of the Nevada Senate from 1972 to 2004.  He was the first African-American state senator in Nevada.  He served as Minority Floor leader in 1989 and as President pro tempore in 1991.  Neal was inducted into the Nevada Senate Hall of Fame in 2005, a year after his retirement.  At the time of his retirement, he was the longest served state senator in the history of the state senate.  He moved to Nevada in 1964 and has a degree from Southern University in political science and history.  In 1998, Neal ran unsuccessfully for Governor of Nevada.  His daughter, Dina Neal is a current Nevada Assemblywoman. James Allen Williamson (born May 27, 1951) is an American attorney and Republican politician from the U.S. state of Oklahoma.  Williamson served in the Oklahoma House of Representatives from 1980 to 1986 and in the Oklahoma Senate from 1996 to 2008.  From 1998 to 2002 he served as Assistant Republican Floor Leader, and then as Floor Leader from 2003 to 2004. Jim Tracy (born October 9, 1956) is an American politician and a member of the Tennessee Senate for the 16th district, which is composed of Bedford County, Moore County, and part of Rutherford County.  He is currently the Assistant Floor Leader of the Senate Republican Caucus, the Chair of the Senate Transportation Committee, and a member of the Senate Education Committee and the Senate State and Local Government Committee.  Jim Tracy graduated from the University of Tennessee at Martin with a Bachelor of Science degree and works as an insurance agent. The party leadership of the United States Senate refers to the officials elected by the Senate Democratic Caucus and the Senate Republican Conference to manage the affairs of each party in the See.  Each party is led by a floor leader who directs the legislative agenda of his caucus in the Senate, and who is augmented by an Assistant Leader or Whip, and several other officials who work together to manage the floor schedule of legislation, enforce party discipline; oversee efforts to elect new Senators, and maintain party unity. Jesús G. "Chuy" García (born April 12, 1956) is an American politician and member of the Democratic Party who serves on the Cook County Board of Commissioners.  A candidate for Mayor of Chicago, Garcia finished second in the February 24, 2015 mayoral election, forcing a head-to-head runoff vote between himself and incumbent Rahm Emanuel.  Garcia was defeated in the April 7 runoff by Emanuel.  Garcia was elected to the Chicago City Council in 1986, and in 1992 became the first Mexican-American member of the Illinois State Senate.  In 2010, Garcia won election to the 7th district Cook County Board of Commissioners, and after his election was appointed floor leader by Cook County President Toni Preckwinkle.  A progressive and a reformer, García is a Preckwinkle ally and was a supporter of former Chicago Mayor Harold Washington. Oscar Wilder Underwood (May 6, 1862 – January 25, 1929) was an American lawyer and politician from Alabama, and also a candidate for President of the United States in 1912 and 1924.  He was the first formally designated floor leader in the United States Senate, and the only individual to serve as the Democratic leader in both the Senate and the United States House of Representatives. Samuel Morgan "Sam" Slom (born April 13, 1942) is an American politician.  Slom was the sole Republican member of the Hawaii Senate from 2010 until his defeat in 2016.  Between 1996 and 2016, Slom represented the 9th District, which includes Hawaii Kai, Aina Haina, Kahala and Diamond Head on the island of Oahu.  As the sole Republican senator, he was the senate minority leader and floor leader of the Hawaiian Senate.  He also served on all 16 Senate committees and on every special committee and subcommittee.  He is a native of Allentown, Pennsylvania. John Young Brown Sr. (February 1, 1900 – June 16, 1985) was an American attorney and politician.  He was a state representative for nearly three decades, serving one term as speaker of the Kentucky House of Representatives and as majority floor leader during the term of Governor Edward T. Breathitt.  He was elected to one term in the U.S. House of Representatives from March 4, 1933 to January 3, 1935 to an at-large seat elected statewide on a general ticket.  He was an unsuccessful candidate for the Democratic nomination for Governor of Kentucky in 1939 and the unsuccessful candidate for the United States Senate in 1946 and 1966.  He was a member of the Democratic Party.
Answer: Oscar Wilder Underwood