LEXINGTON, Va. — It was supposed to be a friendly crowd.Mostly white, male and middle-aged, they had gathered in this college town in the Shenandoah Valley to hear about the National Rifle Association plan to blunt gun control legislation in Richmond, the state capital. About 200 people sat around the packed room; many leaned back in chairs, arms crossed, nodding along. A dozen wore black and yellow NRA hats.But two months after voters gave Democrats complete control of Virginia state government for the first time since 1994, the mood in this carpeted Hampton Inn conference room was dark at ti...