Question: Who made an unsuccessful bid to fill the US Senate seat vacated by the Senate Majority Leader from 2003 to 2007?

Context paragraphs:
Donna Malpezzi: Donna Malpezzi is a prominent attorney in Pennsylvania, where she is chief counsel for Pennsylvania Senate Majority Leader Dominic F. Pileggi.  She also worked as chief counsel for the previous Senate Majority Leader, David J. Brightbill and moved to Pileggi's office after Brightbill was defeated following the 2005 Pennsylvania General Assembly pay raise controversy.  Prior to that, she was an attorney in the office of Senator F. Joseph Loeper.

United States Senate elections, 1952: The United States Senate elections of 1952 was an election for the United States Senate which coincided with the election of Dwight D. Eisenhower to the presidency by a large margin.  The Republicans managed to make a net gain of two seats, which was reduced to one when Wayne Morse (R-OR) became an independent.  The Republicans held a 49 to 47 seat majority after Morse's switch.  This election was the second time in history (after 1932) that the party in power lost their majority and the Senate Majority Leader lost his own re-election bid.  (In addition, this was the second consecutive election in which a sitting Senate leader lost his seat.)

Florida Senate Majority Office: The Florida Senate Majority Office consists of the Majority Leader, Senator Lizbeth Benacquisto, R-Ft.  Myers, who represents the members of the Majority Party in the Senate, as well as a team of professional staff.  As the political extension of the Office of the Senate President, the Senate Majority Office enables the Republican Caucus to fully participate in the governmental process; providing accurate information and services in a professional manner and enabling members to make unified, informed decisions affecting the quality of life of the people they represent.

Chip Rogers: William "Chip" Rogers, born May 3, 1968, is the President and CEO of AAHOA, the largest hotel owners association in the United States.  Rogers is a former American politician from the state of Georgia.  He is a Republican and was first elected in 2002 to the Georgia General Assembly to the Georgia House of Representatives, in 2004 he was elected to the Georgia State Senate.  Rogers was unanimously chosen as the Senate Majority Leader of the U.S. state of Georgia in 2008 and again in 2010.  In November 2012 Rogers resigned his position as Senate Majority Leader, and in December, he resigned his position in the state Senate.  He took up the position of host and Executive Producer of the statewide Georgia Public Broadcasting radio program Georgia Works.  Following this he became the President of AAHOA.

John Morse (US politician): John P. Morse is a former American politician who was a state senator in the Colorado Senate from 2007 to 2013, serving as president of the senate in 2013.  He is a member of the Democratic Party.  Morse represented Senate District 11, which encompasses Manitou Springs, Colorado and eastern Colorado Springs.  On April 17, 2009, he was selected to become Colorado's next Senate Majority Leader, following the resignation of Senate President Peter Groff and the promotion of previous Majority Leader Brandon Shaffer.  On September 10, 2013, Morse was recalled from office as a reaction to his involvement in passing gun control laws.  He was the first legislator to be successfully recalled in the state's history.

Gordon MacInnes: Gordon A. MacInnes is a Democratic politician from New Jersey who has served twice in the state Legislature.  MacInnes was elected to the state Assembly in 1973 in a heavily Republican Morris County district, as part of the Watergate-driven Democratic landslide of that year.  He was defeated in his re-election bid in 1975.  In 1993, he won election to the state Senate in a major upset over incumbent Senate Majority Leader John Dorsey, again in a heavily Republican district.  He again failed to win re-election in 1997, losing to Republican Anthony Bucco, who continues to hold that Senate seat.

John F. Campbell (politician): John F. Campbell (born March 3, 1954) is an American politician from Vermont.  Campbell, a Democrat, is a member of the Vermont Senate, representing the Windsor Vermont Senate District since 2000.  He became Senate Majority Leader in 2003.  He was the Senate Majority Leader of the Vermont Senate until January 5, 2011, when he was elected Senate Pro Tempore for the legislative session.

Foster Campbell: Foster Lonnie Campbell Jr. (born January 6, 1947), is an American politician and member of the Democratic Party from the U.S. state of Louisiana.  Since 2003, he has been a member of the Louisiana Public Service Commission.  He served in the Louisiana State Senate from 1976 to 2002 and was an unsuccessful candidate for governor in the 2007 election against the Republican Bobby Jindal.  He has also run unsuccessfully for the United States House of Representatives for Louisiana's 4th congressional district three times: in 1980, 1988, and 1990, and in 2016, was an unsuccessful candidate for the open U.S. Senate seat vacated by incumbent Republican David Vitter.

Harold Ford Jr.: Harold Eugene Ford Jr. (born May 11, 1970) is an American politician and author who served five terms in the United States House of Representatives as a member of the Democratic Party from  's 9 congressional district , centered in Memphis, from 1997 to 2007.  He is the son of former Congressman Harold Ford Sr., who held the same seat for 22 years.  In 2006, Ford made an unsuccessful bid for the US Senate seat vacated by retiring Bill Frist.  He is a member of the Ford political family from Memphis.  Ford was the last chairman of the Democratic Leadership Council (DLC).

Bill Frist: William Harrison Frist Sr. (born February 22, 1952) is an American physician, businessman, and politician.  He began his career as a heart and lung transplant surgeon.  He later served two terms as a Republican United States Senator representing Tennessee.  He was the Senate Majority Leader from 2003 to 2007.

Supporting paragraphs: Harold Ford Jr. Bill Frist
Answer: Harold Eugene Ford Jr.