By William Crum Staff Writer wcrum@oklahoman.comAn initiative petition drive aimed at calling a vote on a temporary citywide income tax to supplement lagging teacher pay has begun. A coalition of education and political leaders, Save OKC Schools, has 90 days to gather enough signatures to put the proposal before Oklahoma City voters. The proposal calls for a 0.50 percent income tax to raise about $50 million per year.Read more on NewsOK.com