He didn't threaten him. Breitbart stated publicly that if Holder failed to prosecute ACORN based on their willful criminality as already exposed on camera, that he would produce more vid that would make it clear what a head-in-the-sand ostrich Holder was being.
It's called "speaking truth to power." Whether that make Breitbart, or you..., the "dumbass" is for us to decide. You feelin' lucky today... punk?!.
;-/