Can it be considered an act of treason to vote for Obama?

Let me help you here. If you bashed, hated, and wished he was dead, President Bush, well they would think you are patriotic and a great person. If you do not like Obama, and do not support, worship, and idolize him, then you are a bad person, non-patriotic, racist, ignorant redneck. So the act of treason, in their eyes, would be to ask this question. They are planing your death for questioning their anointed one.