Question: What U.S. Senator from the state of Wisconsin was the play The Investigator based on?
Context: Michael Shane Neal (born November 23, 1968) is an American portrait artist.  Neal has created official portraits for the United States Capitol of U.S. Senator Arthur Vandenburg, former Majority Leader and U.S. Senator Robert C. Byrd, 10th Architect of the Capitol Alan Hantman, and over 400 works of art depicting various public figures.  Recent current commissions include Supreme Court Justice Sandra Day O'Connor for the Sandra Day O'Connor School of Law at Arizona State University, former Secretary of Energy Spencer Abraham for the Department of Energy, and U.S. Senator Arlen Specter for Yale Law School. Terry D Wilson (born 1964) is a retired Canadian police officer and hate crime investigator based in London, Ontario. The Investigator (1954) was a radio play written by Reuben Ship and first broadcast by the Canadian Broadcasting Corporation (CBC) on May 30 of that year.  The play lampooned the actions of the US House Committee on Un-American Activities (HUAC) and Senator Joseph McCarthy. Ed Du Bois III is an American private investigator based in Miami, Florida.  DuBois is President of Investigators, Inc. Since 1968, he has been the National Football League’s Security Representative in Miami. Dick and the Duchess is a 1950s CBS situation comedy filmed and set in London, England, and starring Patrick O'Neal and Hazel Court.  O'Neal starred as Dick Starrett, an American insurance claims investigator based in London, who is married to Jane, an attractive patrician Englishwoman whom he calls "Duchess".  Court was also known for her roles in horror films.  Sheldon Reynolds was the executive producer of the series, filmed by Associated-Rediffusion Television. Joseph Raymond McCarthy (November 14, 1908 – May 2, 1957) was an American politician who served as U.S. Senator from the state of Wisconsin from 1947 until his death in 1957.  Beginning in 1950, McCarthy became the most visible public face of a period in the United States in which Cold War tensions fueled fears of widespread Communist subversion.  He is known for alleging that numerous Communists and Soviet spies and sympathizers had infiltrated the United States federal government, universities, film industry, and elsewhere.  Ultimately, the smear tactics he used led him to be censured by the U.S. Senate.  The term "McCarthyism", coined in 1950 in reference to McCarthy's practices, was soon applied to similar anti-communist activities.  Today, the term is used in reference to what are considered demagogic, reckless, and unsubstantiated accusations, as well as public attacks on the character or patriotism of political opponents. Carol Elizabeth Moseley Braun, also sometimes Moseley-Braun (born August 16, 1947), is an American diplomat, politician and lawyer who represented Illinois in the United States Senate from 1993 to 1999.  She was the first female African-American Senator, the first African-American U.S. Senator for the Democratic Party, the first woman to defeat an incumbent U.S. Senator in an election, and the first female Senator from Illinois.  She was the only female U.S. Senator from Illinois until Tammy Duckworth who became the U.S. Senator from Illinois in January 2017.  From 1999 until 2001, she was the United States Ambassador to New Zealand.  She was a candidate for the Democratic nomination during the 2004 U.S. presidential election.  Following the public announcement by Richard M. Daley that he would not seek re-election, in November 2010, Braun began her campaign for Mayor of Chicago.  The former Senator placed fourth in a field of six candidates, losing the February 22, 2011, election to Rahm Emanuel. The 2010 United States Senate election in Indiana took place on November 2, 2010, alongside 33 other elections to the United States Senate in other states and elections to the United States House of Representatives and various state and local elections to fill Indiana's class III United States Senate seat.  Incumbent Democratic U.S. Senator Evan Bayh decided in February 2010 to retire instead of seeking a third term shortly after former U.S. Senator Dan Coats announced his candidacy for Bayh's contested seat.  No Democratic candidate submitted enough signatures by the deadline to run, leading Democratic officials to choose U.S. Congressman Brad Ellsworth to be the nominee.  The Libertarian Party nominated YMCA instructor Rebecca Sink-Burris, who had previously run against Evan Bayh in the United States Senate election in Indiana, 1998 but with less success than in this election.  Republican nominee and former U.S. Senator Dan Coats won the open seat. Arthur Tyde is an American software entrepreneur and private investigator based in San Francisco and SE Asia.  He has been an advocate for Open Source software since founding the first Linux Users Group in the San Francisco / Silicon Valley Area.  (BALUG). The 1958 United States Senate elections in Arizona took place on November 4, 1958.  Incumbent Republican U.S. Senator Barry Goldwater ran for reelection to a second term, and defeated former U.S. Senator, and then-Governor, Ernest McFarland in the general election.  The election was a virtual rematch from 1952, where Goldwater defeated McFarland by a narrow margin.  Goldwater had attributed the win to the unpopularity of President Harry S. Truman and popular Wisconsin Senator Joseph McCarthy endorsing his campaign.
Answer: Joseph McCarthy