The Oxford Comma is a tool of the NeoCons. They want you to have to use an extra keystroke every time you type a list, despite it being totally meaningless and illogical. The time that you take typing or writing that extra character, the NeoCons steal a little bit more of your money, and further their agenda.
"I am a Liberal. I am thus intelligent, reasonable, and correct."
Is evil and ridiculously overcomplicated, whereas
"I am a Liberal. I am thus intelligent, reasonable and correct."
Coincides with the very argument that the example sentence puts forth, that Liberals are intelligent, reasonable and correct.