Cornelius Harvey McGillicuddy IV (born August 12, 1967), known popularly as Connie Mack IV, is an American politician and lobbyist. He is the former U.S. Representative for Florida's 14th congressional district, serving from 2005 to 2013. A Republican, he ran for the U.S. Senate in 2012, losing to Democrat Bill Nelson.^[1] He is the son of former Republican U.S. Senator Connie Mack III and the great-grandson of baseball manager Connie Mack.

Mack was born in Fort Myers, Florida, the son of former U.S. Senator Connie Mack III and cancer prevention advocate Ludie Priscilla (née Hobbs).^[2][3] His father represented the district from 1983 to 1989 (when it was numbered as the 13th District), before serving two terms in the U.S. Senate.

Through his father, Mack is the great-grandson of Cornelius McGillicuddy ("Connie Mack"), the manager and owner of baseball's Philadelphia Athletics and member of the Baseball Hall of Fame; the great-grandson of Morris Sheppard, U.S. Senator and Representative from Texas; and the great-great-grandson of John Levi Sheppard, a U.S. Representative from Texas.^[4]

In June 1988, Mack earned his Associate of Arts from Santa Fe Community College^[5] and In 1993, Mack earned his Bachelor of Arts^[6] from the University of Florida. After college, Mack became a marketing executive, working as a consultant to promote the restaurant chain Hooters.^[7]

In 2000, incumbent Republican State Representative Debby Sanderson decided to retire to run for a seat in the Florida Senate. Mack decided to run for the open seat in the Fort Lauderdale–based 91st House District. He defeated Democratic nominee Kevin Rader 56%–44%.^[8] In 2002, he won re-election with 79% of the vote.^[9]

Mack was Chairman of the Committee on State Administration, and in his second term he became the Deputy Majority Leader.^[10]

Early in the election cycle, Mack was considered a potential candidate against incumbent Democratic Senator Bill Nelson in the 2012 Senate election. However, he declined to run on March 25, 2011, citing family and his work in the House of Representatives.^[22] On October 26, 2011, it was announced Mack had changed his mind and that he would seek the Republican nomination because he felt no one in the current field was able to defeat Nelson.^[23] His opponent in the primary was former Representative Dave Weldon, whom Mack defeated, winning 58% of the vote. Mack then lost to Nelson by over one million votes.

In 2013, Mack was hired as a partner at lobbying firm Liberty Partners Group, where his father was a chairman emeritus.^[25] Following his unsuccessful bid for the Senate, Mack founded two lobbying and consulting firms, Mack Strategies and Liberty International Group. In March 2014, he registered to become a lobbyist for American Task Force Argentina. As of September 2014, he was an executive vice president of public relations firm Levick as well as a registered lobbyist for Levick, Doral Financial and Las Vegas Sands.^[26] Mack considered entering Florida's 19th congressional district special election in 2014 to replace Trey Radel but, in January 2014, officially declined to enter the race.^[27]

In 1992, Mack was involved in a bar fight with professional baseball player Ron Gant in Georgia. Mack suffered a broken ankle in the fight but a jury ultimately found that Gant was not liable for Mack's injuries.^[31][32]

Mack and Ann Galluzzo were married in 1996 and divorced in 2006. They have a son named Connie Mack V and daughter named Addison Mack.

In 2007, while representing his Florida district in the U.S. House of Representatives, Mack married then-U.S. Representative from California Mary Bono (R-CA), former wife of Glenn Baxley and widow of Sonny Bono.^[33] They were the third married couple to serve in the House of Representatives simultaneously.^[34] Mack and Bono divorced in 2013.^[35] He married Jennifer Key, an international development expert, in 2018. They have a son named William Arthur McGillicuddy.