Article 3 Section 3 of the Constitution defines treason by saying this:
"Treason against the United States shall consist only in levying War against them, or in adhering to their Enemies, giving them Aid and Comfort."
America as a nation is defined by our Constitution and our borders.
So in my opinion much of the "change" Obama has pushed on America constitutes treason, because it is in effect levying war on the Constitution, which defines us as a nation. And his aiding and abetting an invasion of foreign nationals across our borders also constitutes treason. His attempts to disarm the militia is treason too. His political allies, as well as his PR team the liberal press, who adhered to him in these treasonous acts and gave him aid and comfort, are also traitors.
The enemy has too much power though to be charged and brought to justice, and it's unlikely that we will even be able to do more than slow their aggression, given the current political realities. But if they can be stopped and brought to justice I'm all for it.