Leaders in the Oregon Legislature are forming a temporary bipartisan committee to spend the next several weeks hashing out a business tax overhaul to go to voters for final approval in a special election.  House Speaker Tina Kotek and Senate President Peter Courtney, both Democrats, said the Joint Tax Reform Committee will involve the 14 lawmakers on the House and Senate revenue panels.  Republican 52nd District Representative Mark Johnson says this will bring a conversation that has been going on behind closed doors out into the open, and says there is a realistic solution that business interests have indicated could work, involving a small increase for various business entitites and high wage earners to fully fund Measure 98 and invest in other education-related outcomes. Johnson says it would have a two-year sunset with the understanding during that time work would take place on a new business and personal tax system for the state.