Cotton for sure. Well, Cotton and several other republicans. Boener should be tried for treason too. There has been so much obstruction to government by those who are supposed to govern us that there are some people who deserve prison time for their wanton neglect. Take a survey, I bet man would agree that actions of the Senate and House have been traitorous.
Obama isn't the government or the nation, so although I generally dislike republicans, I fail to see how a doing something that undermines Obama is actually treasonous, especially when both the executive and legislative branches are jointly responsible for foreign policy. If democrats and republicans resorted to crying "treason" every time one of them was obstructionist of the other party's policies, there'd be no more democrats or republicans left. (Which doesn't sound terrible, now that I mention it...)