Article III, Section. 3. "Treason against the United States shall consist only in levying War against them, or in adhering to their Enemies, giving them Aid and Comfort. No Person shall be convicted of Treason unless on the Testimony of two Witnesses to the same overt Act, or on Confession in open Court."
Have at it. I assume you mean the "adhering to their enemies" part.
Obama's affection for and involvement with the Muslim Brotherhood and its affiliates is no secret. Since the Bush administration was also in deep with the Wahabists, and since the Congress and both the Bush and Obama administrations have welcomed Wahabi and MB infiltration of US mosques with open arms, and since the avatar of this policy has been elected President twice, and since Federal, State, and local governments have provided land, funds, and logistical support for the construction of their mosques all over the US and the world - since all of these things are true and beyond dispute - proving, beyond a reasonable doubt, that these forces are "enemies of the United States" would be very difficult, even for your hypothetical first year law student.
For example, if you were testifying that the Muslim Brotherhood was an enemy of the United States at Obama's trial, I would read you the following and ask you, assuming these facts to be true, how you could testify truthfully to your claim:
"CAIR [the US Muslim Brotherhood] officials have met or regularly meet with current and former U.S. Presidents, members of their respective administrations, members of the United States Congress, governors, mayors, members of state legislatures, and county commissioners. Several CAIR affiliates have received proclamations and citations from mayors and county commissioners.[81] The organization itself has received praise from congressmen and women to top military officials such as General Wesley Clark, who "applaud[ed] its efforts to ensure that all Americans…are treated equally and given the same constitutional rights."[82] CAIR also regularly meets with national, state, and local law enforcement officials including the Department of Homeland Security.[14][83] CAIR has conducted diversity/sensitivity training on Islam and Muslims for the FBI, US Armed Forces, several local and state law enforcement agencies, and many U.S. corporations."
^From Wiki? That info is from CAIR’s own press releases.