As Washington plows toward the legal pot promised land, it's finding that getting the cannabis market off the ground has been even tougher than anyone imagined. Among the frustrated are growers who have been waiting months for permission to start raising their bar-coded plants. Advocates who wish more public health messaging had been done by now, and would be pot vendors who say bad luck, minor oversights on their applications, or errors by state officials have torpedoed otherwise promising efforts.