1. The blatant speading of an agenda much to the discredit of one's character even to such a degree that the "means" become more important than the spirit of their "ends."
2. To be so polarized in one's set of beliefs that opposing beliefs, no matter how factual, beneficial or even helpful to one's own belief, will be seen as wrong.
3. Myopic granstanding done by one side of two or more diametrically opposed political, social or economic positions.
He is dealing with information manipulation and political agendism that sways people's thought process to his points of view.