Question: When did the senator who vacated a U.S. Senate seat which Thomas M. Davis considering a run for in 2008 serve as Secretary of the Navy?

full_context: Document 1: Gerald Lee Warren: Gerald Lee "Jerry" Warren (August 17, 1930 – March 20, 2015) was a United States journalist and newspaper editor at "The San Diego Union-Tribune". He served under Ron Ziegler as deputy press secretary in the Richard Nixon administration until 1974. He served as Nixon's "de facto" final White House Press Secretary after Ron Ziegler's appointment as Assistant to the President in June 1974, though Zielger kept the title. He then held the same position as well as White House Director of Communications in the Gerald Ford administration until 1975.
Document 2: John Cornyn: John Cornyn III (born February 2, 1952) is an American politician, lawyer and the senior United States Senator from Texas, serving since 2002. He is a member of the Republican Party and the current Senate Majority Whip for the 115th Congress. Cornyn previously served as Chairman of the National Republican Senatorial Committee from 2007 to 2011.
Document 3: Mark Earley: Mark Lawrence Earley (born July 26, 1954) is an American politician and Virginia lawyer. As a member of the Republican Party, he was elected to the Virginia State Senate (1988–1998), and then elected Attorney General of Virginia (1998 to 2001). In 2001, he resigned as Attorney General to focus his time on the 2001 campaign for Governor of Virginia. He ran to succeed James Gilmore, but lost to businessman and Democratic Party leader Mark Warner.
Document 4: Rick Davis (politics): Richard H. "Rick" Davis, Jr. (born 1957) is an American political consultant. He currently serves as a Partner and Chief Operating Officer of Pegasus Sustainable Century Merchant Bank, a private equity firm specializing in sustainable development projects. He is a managing partner of the business development and public affairs consulting firm Davis-Manafort, located in Alexandria, Virginia. He is best known for being the National Campaign Manager of John McCain's 2008 Presidential campaign (from April 25, 2007 to November 4, 2008). In that capacity, he oversaw the development and implementation of all campaign strategy and policy development. Davis also served McCain as National Campaign Manager for his 2000 Republican Presidential Primary campaign ( April 6, 1999 to March 9, 2000).
Document 5: Gerald Davis (politician): Gerald M. Davis (born 1936) is an American politician from Maine. Davis, a Republican from Falmouth, represented District 11 in the Maine Senate from 2008-2010. He was defeated for re-election in 2010 by unenrolled (independent) Richard Woodbury of Yarmouth. Davis' Senate district covered part of Cumberland County, specifically Chebeague Island, Cumberland, Falmouth, Gray, Long Island, North Yarmouth and Yarmouth. He served in the Maine House of Representatives from 1996 to 2006. He also served on the Falmouth School Board.
Document 6: Thomas Kean Jr.: Thomas Howard "Tom" Kean Jr. (born September 5, 1968) is an American Republican politician, the current Minority Leader of the New Jersey Senate, and a New Jersey State Senator. From 2001 until 2003, he was a New Jersey General Assemblyman, and represented the 21st Legislative District, which includes parts of Union, Morris, Somerset, and Essex Counties. In 2003, he was elected a New Jersey State Senator, and in January 2008 became Minority Leader of the New Jersey Senate.
Document 7: John Ensign: John Eric Ensign (born March 25, 1958) is an American veterinarian and former politician based in Las Vegas, Nevada. He was a Congressman and United States Senator from Nevada, serving in the latter seat from January 2001 until May 2011. He resigned amid a Senate Ethics Committee investigation.
Document 8: Tom Campbell (California politician): 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.
Document 9: Tom Goodwin (New Jersey politician): Thomas "Tom" Goodwin (born c. 1951) is an American Republican Party politician and financial planner who was selected on March 11, 2010 to represent the 14th legislative district in the New Jersey Senate, after the resignation of Bill Baroni left a vacancy. He was sworn in on March 15, 2010 and sought re-election in a special June primary and November general election. He was the most junior senator in New Jersey Senate as of March 15, 2010 until November 2010, when he was defeated by Assemblywoman Linda R. Greenstein.
Document 10: John Warner: John William Warner (born February 18, 1927) served as Secretary of the Navy from 1972 to 1974 and as a five-term Republican United States Senator from Virginia from January 2, 1979, to January 3, 2009. He did not seek reelection in 2008. He works for the law firm of Hogan Lovells, where he had previously worked before joining the United States Department of Defense.
Document 11: Thomas M. Davis: Thomas Milburn "Tom" Davis III (born January 5, 1949) is a former Republican member of the United States House of Representatives, representing Virginia's 11th congressional district in Northern Virginia, and currently serves as the Rector and Professor at George Mason University. Davis was considering a run for the U.S. Senate seat being vacated by five-term incumbent and fellow Republican John Warner in the 2008 election, but decided against it. He announced on January 30, 2008, that he would not seek reelection to an eighth term. Davis resigned from Congress on November 24, 2008.
Document 12: Patrick Davis (politics): Patrick Davis is a political consultant and strategist. Davis has worked in the George H.W. Bush Administration and the National Republican Senatorial Committee, most notably as Political Director in 2004. Davis also served as the Executive Director of the South Dakota Republican Party before going into private business in 2005. He lives in Colorado Springs, Colorado, with his wife, Jo Ann, and their two children.
Document 13: R. James Woolsey Jr.: Robert James "Jim" Woolsey Jr. (born September 21, 1941) is a national security and energy specialist and former Director of Central Intelligence who headed the Central Intelligence Agency from February 5, 1993, until January 10, 1995. A lawyer by training and trade, he held a variety of government positions in the 1970s and 1980s, including as Under Secretary of the Navy from 1977 to 1979, and was involved in treaty negotiations with the Soviet Union for five years in the 1980s. His career also included time as a professional lawyer, venture capitalist and investor in the private sector.
Document 14: Jeremiah Denton: Jeremiah Andrew Denton Jr. (July 15, 1924 – March 28, 2014) was a U.S. Senator representing Alabama from 1981 to 1987, and a United States Navy rear admiral and aviator in the Vietnam War.
Document 15: Tom Rasmussen: Tom Rasmussen is a retired member of the Seattle City Council, first elected in 2003. Between September 2004 and December 2007 he was chair of the Housing, Human Services & Health Committee, vice chair of the Urban Development & Planning Committee, and a member of the Transportation Committee. On January 7, 2008 Tom was sworn in for his second term on City Council. From January 2008 through December 2009, he was chair of the Parks & Seattle Center Committee, the vice chair of the Culture, Civil Rights, Health and Personnel Committee, and the Labor Policy Committee. He was also chair of the Transportation Committee, vice chair of the Economic Resiliency and Regional Relations, and a member of Parks and Seattle Center Committee.
ground_truth: 1972 to 1974