An argument is an attempt to persuade someone of something, by giving reasons for accepting a particular conclusion as evident.

The argument (agreeably a mistake on my part) was

People who believe in the claims made on this webpage have a very high change of voting for W bush, because both things are stupid, and unless you belong to a very small minority that is not on this website, it would be to the detriment of your financial wellbeing to do so and therefore against your interest. Which would constitute stupid. Belonging to the same category of people, lets say the stupids, chances are higher that you do/believe things that stupids believe.

I will retract that argument on the spot, but its still an argument.

Idiot though is an antiquated word for the mentally challenged, and it is a derogatory remark.