The big shots in Trenton have just two weeks to settle on a budget, a time of year when good ideas and bad ideas do battle, with billions of dollars at stake. It is a curiosity of this year that Speaker Craig Coughlin is giving us both. So, let’s hope he’s half-successful. The good idea is that Coughlin is determined to kill a plan being pushed hard by Gov. Phil Murphy, according to several sources, to hike the sales tax and raise about $1 billion a year. Coughlin stepped out of the smoke-filled backroom last week to tell NJ Advance Media’s Brent Johnson that he hated the idea. “I don’t think …