[MrB]

He could have spelled it completely out and it wouldn’t have been a “threat”.
The left (I know there’s a double standard) had people posting much worse than that, including direct threats, without “knocks on the door”.

[Jyotishi]

That’s right, tweeters who threatened Gov. Romney on Twitter still have their accounts and were likely not even investigated.

[grobdriver]

people posting much worse than that, including direct threats, without “knocks on the door”.

It wasn't one of "his people" (Holder) doing the knocking...