It Takes a Village Idiot, and I Married One is episode 17 of family guy season 05. It was originally aired on May 13, 2007.
When Lois runs for mayor of Quahog, she isn’t the front-runner until she “dumbs down” her political views. Once in office, she’s corrupted by the power and starts accepting bribes so that she can buy herself expensive trinkets. Meanwhile, Peter’s enjoying being the “first lady” and all of the perks that go along with it.