According to the federal complaint against him, Norman Leboon of Philadelphia has admitted making some 2,000 videos that contained threats. A sampling of his "work" reveals rambling incoherent videos that mix pseudo-religious incantations with random warnings and threats. In one video he addresses President Obama, Vice President Biden, Nancy Pelosi and Harry Reid by name and says, "Your punishment is coming, the swine, it will be severe, and you will beg for mercy to your god, it will be severe, you will know god's swine, god has warned you." (Some conservatives are already chortling over the fact that Leboon contributed to Obama's 2008 campaign, though it's not clear what that's supposed to signify.)Beyond that, though, there's a pretty clear difference -- to me, at least -- in the threats against Democratic and Republican lawmakers, in that I haven't seen any Democratic lawmakers saying (like Republicans did), "Well, yeah, violence was wrong -- but you can't blame people for being angry!" And incidentally, I haven't read all the comments by the "deranged leftists" at TPM, but they seem pretty solidly behind arresting the guy who threatened Cantor.
There's violent loopiness on both sides. The difference, from what I can tell, is that the GOP leadership does a better job of making excuses for (and even promoting) the violent loops on there side. It's kind of a critical difference.