But there's more to the story.
Apparently, Cliven Bundy is a man who refuses to recognize even the existence of, much less the authority of, the federal government of the United States of America. For that reason, he will graze his cattle on federal land while refusing to pay any taxes or fees for that privilege. That makes him a bit of a rebel, and in Hannity's world, America needs to push back against the taxman.
Jon Stewart recently had great fun with this.
Of course, then things got much worse.