South Carolina Governor Mark Sanford pauses as he addresses the media at a news conference at the State House in ColumbiaBy way of Harriet McLeod CHARLESTON, South Carolina (Reuters) – A comedian's sister and a philandering ex-governor lead a container of 18 candidates looking for to fill a vacant congressional seat in Tuesday's unique election, reminding voters how "Appalachian Trial" was a euphemism for extramarital affair. Coastal South Carolina's 1st Congressional District needs to fill the emptiness left by using Tim Scott, who used to be appointed to replace Jim DeMint within the Senate after DeMint resigned to move the Heritage Foundation, a conservative assume tank. …