If there's a big puddle of water in the middle of the basement, a homeowner checks for leaking pipes and calls the plumber. If there's a pool of oil in the garage, a driver gets a mechanic to inspect the car's plugs and seals right away. And when three different groups, two of them grass-roots and one a statewide governmental association, say they're holding petition drives for referendums on tax reform, voters could justly conclude that something's broken in the way the state collects and disburses its revenues. OK, so that's not exactly a secret. The state is $240...