If, in fact, Obama did enter into a conspiracy with Clinton to include false information in official intelligence reports with the aim of subverting the election, he could not be prosecuted for given the order to include that false information to intelligence officials because as President he has the power to do so, but he might be indicted for entering into a conspiracy with Clinton to do so because such an act lies outside of his official powers as president. In other words, he acted as an individual when entering into the conspiracy and so no presidential immunity would apply. The charge would not be treason, but it might be sedition.