Question: In 2000, Tom Campbell lost his Senate race to an incumbent who has served since what year?

Context articles: Ron DeSantis
C. Richard Fiore
Tom Campbell (California politician)
Tom Campbell (North Dakota politician)
Tom Campbell (radio personality)
Ted Haik
Tom Campbell (Australian footballer)
William Joseph Campbell
Peter Fitzgerald (politician)
Dianne Feinstein

Ronald Dion DeSantis (born September 14, 1978) is an American politician who has been the United States Representative for Florida 's 6 congressional district since 2013.
 A member of the Republican Party, he ran in Florida's 2016 U.S. Senate election; however, DeSantis withdrew from the race following incumbent Senator Marco Rubio's announcement that he would seek reelection to the Senate, reversing his initial pledge not to run, on June 22, 2016.
 After Rubio's decision to re-enter the U.S. Senate race, DeSantis opted to run for re-election to his U.S. House seat.
C. Richard Fiore (July 18, 1931 – July 12, 2003) was an American Republican Party politician who served two terms in the New Jersey General Assembly.
 Fiore(along with Ralph R. Caputo) was elected as a Republican to the State Assembly in 1967, defeating Eugene Molinaro and Warren Davis in the Republican primary and Democratic incumbents Armand Lembo and Joseph Biancardi.
 They represented Essex County's District 11C.
 Fiore and Caputo were re-elected in 1969 against Democrats Carmen Orechio and Joseph Iannuzzi.
 Fiore lost his bid for a third term in 1971, losing a multi-candidate General Election.
 The winners were Independent Anthony Imperiale and Democrat Frank G. Megaro, who received 13,857 and 12,436 votes, respectively.
 Defeated were incumbent Democratic Assemblyman Paul Policastro (10,825 votes), Fiore (8,215 votes), Republican Ralph D'Ambola (7,351 votes), Independent Ronald J. Del Mauro (3,323 votes), and independent Nicholas A. Ciufi II (2,729 votes).
 Fiore became the Republican nominee for State Senator in 1973, running for an open seat in the newly created 30th district, which comprised Newark's East Ward, and Harrison and Kearny in Hudson County.
 Imperiale, running as an Independent, won that Senate race with 24,756 votes (49%), against Democrat Gregory J. Castano with 18,286 votes (36%) and Fiore, with 7,131 votes (14%).
Thomas John Campbell (born August 14, 1952) is an American academic, educator and former politician.
 He is Professor of Law at the Dale E. Fowler School of Law, and a Professor of Economics at the George Argyros School of Business and Economics, at Chapman University, in Orange, California.
 He was Dean of Chapman University School of Law from 2011-16, a former five-term Republican United States Congressman from California's 12th and 15th districts, former member of the California State Senate, a former professor at Stanford Law School, former dean of the Haas School of Business, and former professor of business administration at the University of California, Berkeley.
 In 2000 he retired from his House seat to run for the U.S. Senate but lost decisively to incumbent Dianne Feinstein.
 He served as the Director of Finance for the State of California from 2004 to 2005.
 On June 8, 2010, he lost his third bid for the United States Senate, and second for the seat held by Democrat Barbara Boxer, losing the Republican nomination to Carly Fiorina.
Tom Campbell is an American politician, farmer, and entrepreneur.
 He serves as a Republican member of the North Dakota Senate.
 He was first elected in 2012 and was reelected in 2014.
 He co-founded Campbell Farms in Grafton, ND with his brothers in 1978, and the company has expanded to multiple locations.
Tom Campbell (nicknamed Tall Tom Campbell, fl.
 late 20th century) is an American radio announcer and commercial voiceover talent.
Theodore Michael Haik, Jr., known as Ted Haik (born April 8, 1945), is an attorney in New Iberia, Louisiana, who was a Democratic member of the Louisiana House of Representatives from 1976 to 1996.
 He represented House District 49, which includes portions of Iberia, St. Mary, and Vermilion parishes.
 He is the older brother of U.S. District Judge Richard T. Haik of Lafayette and Suzanne Haik Terrell of New Orleans, the last Louisiana elections commissioner who served from 2000 to 2004 and the unsuccessful Republican candidate in the 2002 U.S. Senate race against the incumbent Democrat Mary Landrieu.
Tom Campbell (born 2 November 1991) is a professional Australian rules footballer who plays for the Western Bulldogs in the Australian Football League (AFL).
 He was recruited by the club in the 2012 Rookie Draft, with pick #27.
 Campbell made his debut in Round 13, 2012, against Brisbane Lions at Docklands, having been promoted to the senior list to replace the suspended ruckman Will Minson.
William Joseph Campbell (March 19, 1905 – October 19, 1988) was a United States federal judge and the longest serving Chief Judge of the United States District Court for the Northern District of Illinois.
 In 1970 the Library of the United States Courts of the Seventh Circuit was named "The William J. Campbell Library of the United States Courts."
.
 Judge Campbell's son is the former five-term U.S. Representative Tom Campbell of California.
Peter Gosselin Fitzgerald (born October 20, 1960) is a former United States Senator from Illinois.
 A Republican, he served from 1999 to 2005.
 Fitzgerald defeated the Democratic incumbent in 1998, becoming the first Republican senator from Illinois to win a U.S. Senate race in 20 years.
 He had previously served in the Illinois State Senate from 1992 to 1998.
Dianne Goldman Berman Feinstein ( ; born Dianne Emiel Goldman; June 22, 1933) is the senior United States Senator from California.
 A member of the Democratic Party, she has served in the Senate since 1992.
 She also served as the 38th Mayor of San Francisco from 1978 to 1988.