[badman_ting]

> Every argument is ad hominem nowadays.

Careful... http://plover.net/~bonds/adhominem.html

[qu4z-2]

In fairness, the form

  Thomas Jefferson said that [some well reasoned argument or opinion]

  Yeah, but Thomas Jefferson was a slave owner. 
  [and thus we shouldn't consider his argument]

is pretty clearly ad hominem.