Two men with possible gang affiliations have been charged with capital murder and two other suspects are expected to be charged in the beating death of a Loudoun County man during a morning stroll with his wife last month, authorities said yesterday. The attack was a "random robbery gone bad," Loudoun Sheriff Stephen O. Simpson said. Police began to home in on the four suspects while executing search warrants in connection with a flurry of burglaries, robberies and assaults in Loudoun County. Some suspects appear to be either members of or associated with a regional street gang, but it does...