Lisa Simpson's years of being the family geek -- teased, bullied and misunderstood -- were rewarded last night on 'The Simpsons' (Sun., 8PM ET on FOX). First lady Michelle Obama made a special appearance on Lisa's behalf, reminding the good citizens of Springfield (and all of us) to be nice to nerds: They end up running the country. Lisa Simpson's years of being the family geek -- teased, bullied and misunderstood -- were rewarded last night on 'The Simpsons' (Sun., 8PM ET on FOX). First lady Michelle Obama made a special appearance on Lisa's behalf, reminding the good citizens of Springfield (and all of us) to be nice to nerds: They end up running the country.