Following his term as governor, Slaughter became a Baptist lay minister and served on the first board of trustees of Georgetown College.
Following the expiration of his term as Secretary of State, Governor Gabriel Slaughter appointed Hardin to the U.S. Senate seat vacated by William T. Barry, who resigned.
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Both his grandfathers were well-known Kentucky frontiersman Edward Worthington and Gabriel Slaughter and his ancestry can be traced to President James Monroe.