Donald Trump has had quite a week, making jokes about Hillary Clinton’s potential murder before declaring that she and Barack Obama are the co-founders of the Islamic State. He said it, and then he said it again the next morning, and now he says it was sarcasm. “Ratings challenged @CNN reports so seriously that I call President Obama (and Clinton) ‘the founder’ of ISIS, & MVP,” he tweeted this morning. “THEY DON’T GET SARCASM?”