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|author=Lee Cokorinos|title=The Assault on Diversity: An Organized Challenge to Racial and Gender Justice''|publisher=Rowman & Littlefield |page 108.</ref>  Goldwater carried Georgia but lost forty-four states to U.S. President [[Lyndon B. Johnson]]. Two years later, Mattingly would help Howard Hollis "Bo" Callaway (1927-2014) organize the Georgia Republican Party and joined Callaway's ticket as a candidate for the [[United States House of Representatives]] against incumbent Williamson Sylvester Stuckey, Jr. (born 1935), whose father founded the Stuckeyn of gift stores.  Mattingly lost the race but was elected to his party's state executive committee, of which he was the vice chairman from 1968 until 1975. He served as Chairman of the Georgia Republican Party from 1975 to 1977 when he began exploring a race for the U.S. Senate.

|author=Lee Cokorinos|title=The Assault on Diversity: An Organized Challenge to Racial and Gender Justice''|publisher=Rowman & Littlefield |page 108.</ref>  Goldwater carried Georgia but lost forty-four states to U.S. President [[Lyndon B. Johnson]]. Two years later, Mattingly would help Howard Hollis "Bo" Callaway (1927-2014) organize the Georgia Republican Party and joined Callaway's ticket as a candidate for the [[United States House of Representatives]] against incumbent Williamson Sylvester Stuckey, Jr. (born 1935), whose father founded the Stuckeyn of gift stores.  Mattingly lost the race but was elected to his party's state executive committee, of which he was the vice chairman from 1968 until 1975. He served as Chairman of the Georgia Republican Party from 1975 to 1977 when he began exploring a race for the U.S. Senate.

In 1980, Mattingly scored a historic upset by unseating the veteran [[Democratic Party| Democratic]] Senator [[Herman Talmadge]], a former Georgia governor and the son of Governor [[Eugene Talmadge]]. Mattingly outpolled [[Ronald Reagan]], who lost Georgia to native son Democrat [[Jimmy Carter]].<ref>{{cite journal|author]Timothy J. Minchin|title='An Historic Upset': Herman Talmadge's 1980 Senate Defeat and the End of a Political Dynasty|journal=''Georgia Historical Quarterly''|date=2015|volume=99|issue=3|pages=156–197|url=http://search.ebscohost.com/login.aspx?direct=true&db=a9h&AN=111013094&site=eds-live|accessdate=November 2, 2016}}</ ref > Mattingly served in the Senate from January 1981 until January 1987, with membership on the Appropriations Committee and the subcommittee on military construction and veterans matters. Mattingly also served at various times on the Banking and the Housing and Urban Affairs committees. He was a leading proponent of the proposed [[line-item veto]] backed by Reagan but opposed by Congress. Reagan recognized Mattingly for his efforts to establish fiscal sanity in the 1985 [[State of the Union]] address.

In 1980, Mattingly scored a historic upset by unseating the veteran [[Democratic Party| Democratic]] Senator [[Herman Talmadge]], a former Georgia governor and the son of Governor [[Eugene Talmadge]]. Mattingly outpolled [[Ronald Reagan]], who lost Georgia to native son Democrat [[Jimmy Carter]].<ref>{{cite journal|author=Timothy J. Minchin|title='An Historic Upset': Herman Talmadge's 1980 Senate Defeat and the End of a Political Dynasty|journal=''Georgia Historical Quarterly''|date=2015|volume=99|issue=3|pages=156–197|url=http://search.ebscohost.com/login.aspx?direct=true&db=a9h&AN=111013094&site=eds-live|accessdate=November 2, 2016}}</ref> Mattingly served in the Senate from January 1981 until January 1987, with membership on the Appropriations Committee and the subcommittee on military construction and veterans matters. Mattingly also served at various times on the Banking and the Housing and Urban Affairs committees. He was a leading proponent of the proposed [[line-item veto]] backed by Reagan but opposed by Congress. Reagan recognized Mattingly for his efforts to establish fiscal sanity in the 1985 [[State of the Union]] address.

In 1986, a heavily Democrat year nationally, Mattingly was narrowly unseated in his bid for re-election by former [[U.S. Representative]] Wyche Fowler, an [[Atlanta]] [[liberal]].

In 1986, a heavily Democrat year nationally, Mattingly was narrowly unseated in his bid for re-election by former [[U.S. Representative]] Wyche Fowler, an [[Atlanta]] [[liberal]].