America's Newest Weapon is Tryptophan

I'm trying to unpack the message of this cartoon, published last week in the Palestinian Authority's newspaper of record, Falastin. The point of the cartoon is that the Palestinians are being lulled into complacence by Barack Obama's soothing words. But what does the turkey mean? After considering the options, I've come to think that the turkey symbolizes tryptophan, a chemical that induces sleep and which is apparently found in turkey in great quantities. But I don't know. Any ideas?