Trayvon Martin is from Miami, Fl. Had a black gang-banger offed him in Miami Gardens or Overtown, it wouldn't go past the Miami Herald and maybe a 15 second mention on the 6:00 news. News like that very thing is a rather common thing down here, but does not make much in the way of news. Had Trayvon been white and died under similar circumstances, that bit of news would not have made the news at all.
Black on black crime is not news. Black on white crime is not news. White(even a white hispanic) on black crime IS news. This is not an irregularity in the current political cycle.....this goes on at all times.