Question: Since what year has the senator that where Trevor Blackman had his start in politics as a staffer been in office?

Context articles: Trevor Blackann
Senator Hotel
Message to the Blackman in America
Members of the Australian Senate, 1923–1926
Susan Lindauer
Roy Blunt
John Ensign scandal
Jane O'Meara Sanders
Fernando de la Rúa
Bill Clinton judicial appointment controversies

Trevor Blackann is an American former lobbyist who pleaded guilty in the Jack Abramoff scandal.
 He began his political career as a staffer for Missouri Republican Roy Blunt.
The Senator Hotel (officially Hotel Senator) (1924–1979) was a nine-story, 400-room Italian Renaissance-style hotel in Sacramento, California located at 12th and L streets across from the California State Capitol building that served as a nexus of California political and social activity for more than 50 years.
 Opened in 1924, the Senator Hotel was where Arthur Samish, one of the most influential and powerful individual lobbyists in the history of California, maintained a suite during the 1930s and 1940s.
 President Gerald Ford spent the night at the Senator Hotel before the September 5, 1975, assassination attempt on him by cultist Manson family disciple Squeaky Fromme.
 Although the Senator Hotel was listed on the National Register of Historic Places in May 1979, the hotel was closed two months later and shuttered with panels placed over the windows that same year.
 The structure was renovated and then reopened in 1983 as an office building under the name Senator Hotel Office Building, giving lobbyists short-walking-distance access to California's state politicians.
Message to the Blackman in America is a book published by Nation of Islam leader and Elijah Muhammad in 1965, and reprinted several times since.
 After the death of Elijah Muhammad in 1975, it was first reprinted by UBUS Communications Systems.
 The Official online edition was uploaded by Seventhfam.com in 1997.
 Beginning with a brief autobiography of Muhammad, it also covers his philosophies on race, the religion of Islam, politics, economics, and social issues, and how they relate to the problems of African-Americans.
 The book also covers his own ideology and how he feels the "Blackman" can improve himself in America.
 The book calls for justice under the laws of America;or for America to help settle Black people in a separate land of its own, "either here or elsewhere."
This period was marked by the number of casual vacancies and the filling of these vacancies was complex.
 While senators were elected for a six year term, people appointed to a casual vacancy only held office until the earlier of the next election for the House of Representatives or the Senate.
 Because the 1925 election was a half senate election, each state would ordinarily elect 3 senators.
 NSW however had 2 additional vacancies as a result of the death of 2 senators with terms ending in 1929.
 The first three elected, Cox, Duncan and Massy-Greene won the full term from 1 July 1926 to 30 June 1932, while the next two elected Abbott and Thomas won the long vacancies finishing on 30 June 1929.
 Massy-Greene who had been appointed to fill one of the vacancies in 1923 ceased to be a senator between 14 November 1925 and the start of his new term on 1 July 1926.
 Victoria had 1 additional vacancy, a short vacancy with the term ending in 1926.
 Plain was the third senator elected and thus won both the short vacancy ending on 30 June 1926 and the full term from 1 July 1926 to 30 June 1932.
Susan Lindauer (born July 17, 1963) is an American antiwar activist and former U.S. Congressional staffer who was charged with "acting as an unregistered agent of a foreign government" and violating U.S. financial sanctions during the run-up to the 2003 invasion of Iraq.
 She was incarcerated in 2005 and released the next year after two judges ruled her mentally unfit to stand trial.
 The government dropped the prosecution in 2009.
 In 2010, Lindauer published a book about her experiences.
 Since 2011 Lindauer has appeared frequently on television and in print as a U.S. government critic.
Roy Dean Blunt (born January 10, 1950) is an American politician who currently serves as the junior United States senator from Missouri, having been in office since 2011.
 He is a member of the Republican Party.
The John Ensign scandal related to revelations in 2009 of an extramarital affair between United States Senator John Ensign from Nevada and campaign aide Cynthia Hampton from 2007 to 2008, and actions taken by Ensign to keep the affair secret.
 He was investigated for potential violations of federal rules about conflict of interest after he arranged for Doug Hampton, Cynthia's husband and formerly a top staffer in his Washington, DC office, to gain a private lobbying job and apparently used his federal position to benefit Hampton's clients.
Mary Jane O'Meara Sanders (born January 3, 1950) is an American social worker, college administrator and political staffer.
 Sanders was Provost and interim President of Goddard College (1996–97) and president of Burlington College (2004–11).
 In June 2017, she started the think tank The Sanders Institute.
 She has been married to U.S. Senator Bernie Sanders since 1988.
Fernando de la Rúa (born September 15, 1937) is an Argentine retired politician of the Radical Civic Union (UCR) who served as President of Argentina from December 10, 1999, to December 21, 2001.
 De la Rúa was born in Córdoba; he entered politics after graduating with a degree in law.
 He was elected senator in 1973 and unsuccessfully ran for the office of Vice President as Ricardo Balbín's running mate the same year.
 In 1993, he was re-elected senator in 1983 and 1993, and as deputy in 1991.
 He unsuccessfully opposed the pact of Olivos between President Carlos Menem and party leader Raúl Alfonsín, which enabled the 1994 amendment of the Argentine Constitution and the re-election of Menem in 1995.
During President Bill Clinton's first and second terms of office, he nominated 24 people for 20 federal appellate judgeships but the nominees were not processed by the Republican-controlled Senate Judiciary Committee.
 Three of the nominees who were not processed (Christine Arguello, Andre M. Davis and S. Elizabeth Gibson) were nominated after July 1, 2000, the traditional start date of the unofficial Thurmond Rule during a presidential election year.
 Democrats claim that Senate Republicans of the 106th Congress purposely tried to keep open particular judgeships as a political maneuver to allow a future Republican president to fill them.
 Of the 20 seats in question, four were eventually filled with different Clinton nominees, fourteen were later filled with Republican nominees by President George W. Bush and two continued to stay open during Bush's presidency.
 Senator Harry Reid, the Democratic leader of the United States Senate during the 110th Congress, and Senator Patrick Leahy, the Democratic leader of the Senate Judiciary Committee under Reid, repeatedly mentioned the controversy over President Clinton's court of appeals nominees during the controversy involving the confirmation of Republican court of appeals nominees during the last two years of Bush's second term.
 Republicans claimed that Democrats were refusing to confirm certain longstanding Bush nominees in order to allow a future Democratic president in 2009 to fill those judgeships.