Flag by Blondinrikard Fröberg is licensed under CC BY 2.0 / Flickr By Bob Dreyfuss / TomDispatch One, erratic and often unhinged, blew up the U.S.-Iran accord that was the landmark foreign policy achievement of President Obama’s second term. He then ordered the assassination of a top Iranian general visiting Iraq, dramatically raising tensions in the region. The other is a traditional advocate of American exceptionalism, a supporter of the U.S.-Iran agreement who promised to restore it upon