With Donald Trump expected to finally leave Mar-a-Lago and kick off his 2024 presidential campaign next week, the Washington Post reports it might be a lonely affair as fellow Republican officeholders are begging off from attending in a key conservative state.. The former president will be making an appearance at the State House in Columbia, South Carolina — a state that is home to two potential rivals for the GOP nomination: Sen. Tim Scott and former Gov. Nikki Haley. That, in turn, has made key Republicans in the state balk at appearing over fears it will be viewed as an early endorsement a…