Not because he's guilty of murder, he was acquitted. But it's "evidence." Of what? This is just harassment for the sake of appealing to Holders "people" as he would put it.
As a side note, Jay Carney made a snot nosed comment after he was asked by a 16 year old intern at the White House press briefing if the government was doing anything about protecting Zimmerman and his family in view of the widespread death threats they were receiving. Much of the Obama Press Corps piled on to young man. "You can't ask questions, this is the press room."