Nearly half of the federal government’s firefighting air tankers are siting idle at a California airport, grounded by the Obama administration in a contract dispute just weeks before wildfires swept through Texas killing a mother and her child, and destroying 100,000 acres. The massive blazes forced Texas Gov. and Republican presidential hopeful Rick Perry​ to abruptly call off a campaign appearance in South Carolina earlier this week to respond to the crisis, and may force him to cancel his first debate appearance Wednesday night. The U.S. Forest Service terminated the contract with Aero Union five weeks ago to operate...