MYRTLE BEACH, S.C. – The Republican candidates were returning to the campaign trail Tuesday slightly bruised but unbowed after a raucous debate that left Mitt Romney fielding attacks from the get-go and all five candidates earning wild reception from a fired-up audience that will be casting votes alongside fellow South Carolinians on Saturday. Romney was put on defense out of the box at the Fox News/Wall Street Journal/South Carolina GOP debate -- answering questions about his record at private venture firm, Bain Capital; distancing himself from super PAC ads against fellow candidates; defending his record as Massachusetts governor, and dodging...