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John Bruce "Jack" Coghill (September 24, 1925 – February 13, 2019) was an American politician and businessman who was the sixth lieutenant governor of Alaska from 1990 to 1994, serving under Governor Walter Hickel. Both were members of the Alaskan Independence Party.
Originally elected as the Republican Party's lieutenant governor nominee in 1990, Coghill had faced serious compatibility issues with running mate Arliss Sturgulewski. AIP chair Joe Vogler vacated his party's nominated slate of John Lindauer and Jerry Ward and replaced them with Wally Hickel and Coghill. While Hickel turned his back on the AIP and their platform almost immediately after taking office, Coghill remained loyal to the party, even becoming their gubernatorial nominee in 1994. Prior to these events, he was well known in Alaskan political circles as "Mr. Republican."