(Olympia, WA)  --  A bill to be introduced in the upcoming legislative session in Washington is aimed at making the state's charter schools constitutional.  The "Spokesman-Review" reports the measure by Spokane Senator Andy Billing would make charter schools accountable to locally elected school boards.  The state Supreme Court previously ruled charter schools unconstitutional, saying they're supported by tax dollars and governed by a board consisting of non-elected members.  In 2012, Washington voters narrowly approved an initiative allowing charter schools in the state.