edit: mpyne said it best somewhere else in this thread:
"He's saying that it's the position of power that
is morally bankrupt, not the man that happens to
be filling it today.
If tomorrow a woman was in the same position of
power then it would still be morally bankrupt,
because it is the position which leads to moral
bankruptcy, not the person filling the position."
Perhaps most politicians aren't good role-models because a career in politics doesn't attract the kind of people who are good role-models.