Please read Sara Robinson's post on the domestic terrorist acts that have occurred since Obama's inauguration: eight episodes in four and a half months:
For the record: This is not business as usual. True, there have always been occasional events, usually dismissed by the corporate media as "isolated incidents," the work of "lone wolf shooters" acting for reasons all their own. But you have to go back a long, long way in American history before you come to a place where you find incidents like this happening an average of once every two weeks. And the chattering classes are finally beginning to realize what those of us who've been faithfully watching the right wing for years have been telling them for a long while now: there's nothing isolated about any of this.
In fact, this is exactly how full-scale terrorism begins.
What she's most worried about is "where this kind of thing historically leads," and she lists five areas of special concern.
Just. Go. Read.
ADDENDUM: Also see her "The Far Right's First 100 Days: Shifting Into Overdrive."