COMPTON — Three days after being elected the first Latino council member in Compton’s history, 26-year-old Isaac Galvan called a unity meeting at Raspados Los Portales, a tiny restaurant in his district. The twenty-some Latinos who showed, a commingling of Galvan’s supporters and doubters, listened on as the District 2 councilman-elect in a dress shirt and shoes said: “I called you to be here because I’m the new councilman and I need your guys’ help….