NASHVILLE, Tenn. (AP) — Momentum is mounting for a possible proposal to raise the state's gas tax for the first time in 25 years.Gov. Bill Haslam told The Tennessean that he thinks a legislative proposal on the issue is close, and could be introduced in the next General Assembly, which convenes in January."At some point and time soon, either this year or next year, I think there will be a bill about gas tax," he told The Tennessean editorial board."It's incumbent upon us as the administration to show here's what we would do with that money if you increased the fuel tax, and then it's also I think important for all of us not to just increase it so that ...