Donald Trump has never declared bankruptcy, but his businesses have -- four times. The real estate mogul, television star and Republican presidential frontrunner filed for corporate bankruptcy in 1991, 1992, 2004 and 2009. Three of the cases were related to his casino and hotel properties in Atlantic City, N.J. And even though more than six years have passed since Trump had his last run-in with Chapter 11, it remains a touchy subject. Trump was quick to clarify at the Republican presidential debate hosted by Fox News in August that he had never filed for personal bankruptcy. Instead, he cast his...