Tomorrow is election day in southern Idaho.  Residents in several counties and school districts will be going to the polls to elect school board members, decide on municipal issues and supplemental levies.new  The Hansen, Richfield, Buhl and Cassia County school districts are all seeking supplemental levies to help them get through another budget year without drastic cuts.  Several districts will be voting on school board members.  Voters in Dietrich will be deciding on improving the water system and a cemetery.  Polls are open from 8 a.m. to 8 p.m. Tomorrow.