Read it. Then read more.
So let's review the situation here.
-- Send suggestive instant messages to former interns and be hounded out of office
-- Have romantic and sexual relationship with then AND former intern, lie about it yourself, tell said intern to lie about it, initiate full-blown coverup with things like hiring a person who just happens to know more than you would like about the relationship to a job as a city planner for which she's wholly unqualified....and nothing will happen.
I suppose the lesson here is either to go for the gusto -- or, if you want to prey on teenagers, change your party affiliation.