New York Times: David had only a slingshot. Texans fighting big coal have Robert Redford. A year after an uproar over pollution forced a turnaround in plans for 19 new coal-fired power plants around the state, the battle has been recounted in a documentary, "Fighting Goliath: Texas Coal Wars," commissioned by Mr. Redford’s Sundance Preserve. It spotlights the unlikely coalition of ranchers, big-city mayors and environmentalists that stymied Gov. Rick Perry and spurred the record $45 billion takeover …