Many of my students enter college with a dangerously naive view of politicians. They think politicians should be revered, and often want to be a politician. Besides teaching them about the rent-seeking aspect of politics, which destroys their naive view of politicians performing the vital role of government efficiencyc, we need to clearly demonstrate their persistent hypocracy. Politicians should not be thought of as role-models.
See this entry for a good overview of the latest scandel involving John Ensign.