The SPLC clearly has their own agenda, so it's laughable when the media frequently portrays them as some objective organization. They're not very different from the Anti-Defamation League.
Please. As one of the few posters here who actually reads their quarterly magazines (I'm a member), they slam and investigate everyone quite evenly. If there is a "bias" in their coverage of right wing extremism, it is because of the sad, but unquestionably quantifiable, fact that a vast majority of extremist anti-government and hate groups have far-right ideology. Outside Black Nationalist hate groups like the Nation of Islam and some ultra extreme environmental or animal rights fringe groups like Earth First! and the Animal Liberation Front, there isn't nearly as much violence or race-hate from the extreme left as the extreme right.