Fake Indian With Master's Degree Speaks

My father was an Air Force officer. My mother met him when she was a WAC. Eventually, she married him.

Ward Churchill suggests, here, that she should have murdered him instead. He also urges his listeners to support and encourage such efforts.

No, he's not joking. Full audio, here. Want video, too?

Here, for reference, is the definition of treason, from the Constitution of the United States.

I'm no lawyer. If what Churchill is saying isn't treason, would someone who is please clarify what would be?