Answer: Ad hominem.
Step-by-step explanation:
Ad hominem is a fallacious argumentative proposition. In it, the actual discussion of the issue at hand is bypassed by rather striking the character of the person presenting the argument, instead of actually hitting the core of the argument itself. In this example, the fact that Senator Smith
is a womanizer, has nothing to do with his objections to affirmative action, and consequently, is pointless to the argument.