MINNEAPOLIS – A warm, welcoming African-American crowd grew increasingly frustrated with Sen. Bernie Sanders on Friday evening, complaining that he’s too scared to talk about specifically black issues. Sanders was here for “A Community Forum on Black America,” introduced by the local congressman, Rep. Keith Ellison, one of Sanders' only two endorsers in the House, But unlike many of the packed rallies that have greeted Sanders in other parts of the country, neither the folding chairs nor the bleachers in the gym here at Patrick Henry High School were full.