Lisa’s teacher, Miss Hoover, is stricken with Lyme disease, and Mr. Bergstrom, a cool, witty, substitute teacher takes her place. Lisa is smitten with the smart, sensitive man, who contrasts so favorable; it seems, with her own father. Meanwhile, Bart decides to run for class president where he is expected to easily triumph over class brain Martin Prince. When Lisa comes to school one day, she is shocked to find that Miss Hoover has recovered and Mr. Bergstrom is gone. Meanwhile, Bart celebrates his victory, only to realize that neither he nor his friends bothered to vote, and Martin has won. Lisa tracks Mr. Bergstrom down to the train station, where he is leaving for another gig. But before he does, he hands her a note, reminding her “You Are Lisa Simpson.” That night Homer cheers up a disconsolate Bart and Lisa, showing he’s not such a bad dad after all.