Just a day after Al Sharpton joined with Critical Mass in Union Square to protest police harassment of cycling protesters, he was leading a march in Harlem decrying youth violence. The march was instigated by the Memorial Day shooting of 7 young people following a holiday basketball tournament. Stemming from an ongoing dispute between two groups of kids, gunshots rang out along Lenox Ave. over a stretch of 10 blocks. Just two days earlier, a......