If Chicago lawmakers and officials supported a city-owned casino proposed by Rep. Bob Rita, the city could put the revenue toward things it needs, he said.Last week Rita, a Blue Island Democrat, chaired a joint session of House and Senate committees to take more testimony on a gambling expansion bill that would add slot machines at horse racing tracks and allow five new casinos — including one in Chicago and one just south of the city.Those measures were previously passed in the Senate during the 2017 session but …