BY JIM HIGHTOWER Being a muckracking political writer often makes me feel like a custodian in a horse barn, constantly shoveling manure. It’s a messy, stinky job – but on the bright side, the stuff is plentiful, so the work is steady. Indeed, I’m now a certified Equine Excrement Engineer, having developed a narrow, but important, professional specialty: cleaning off the horsestuff that careless politicos and sloppy media types keep dumping on the word “populist.” […]