In my opinion? Over the line.
I get what he is trying to say and I know editorial cartoonist have to be provocative. But comparing Americans to al-Qaida? Too far. Apples and oranges. And finally the bottom line is it's counter-productive. The reaction of the right wing will be as expected. But when you start turning the stomachs of the middle, you are no longer interested in reason or winning hearts and minds.
You can vote whether you like it here.
I voted no.