Just a month after he left his position, Don Hanlon — who was once chief of staff to Rep. Nancy Mace (R-South Carolina) — has officially filed his paperwork to run against his former boss in the 2024 Republican primary. The Hill campaign reporter Caroline Vakil quote-tweeted a post from an account that automatically alerts followers of new entrants into congressional races, noting that Hanlon’s candidacy was now “official.” Hanlon was one of three former Mace staffers who all resigned or were fired in December in a sudden mass exodus from the congresswoman’s DC office, citing a “toxic work env…