What is the answer for the question: How does Laura know the President of the United States? from the following article ?

Laura Bayles has been a devoted educator for 38 years. Over that time she has risen to become the principal of Avondale High School. When a local petty gambler, "Click" Dade, begins to prey on her students, she takes a leading position in an attempt to force the gambling location to close down. Dade had been one of her former pupils. Her efforts are opposed by two local politicians, Holland and Joseph Killaine. Holland is a small time political boss, while Killaine is the superintendent of schools. So Bayles decides to fight fire with fire. With a stake of $250, and a pair of Dade's own loaded dice, she wins enough money to open a club to compete with Dade's, taking away his business. However, after an incident in which Killaine's daughter, Gerry, causes a fight at Bayles' club, causing the club's closure. Killaine then presses his advantage, demanding that Bayles also resign as principal, which will make her ineligible for a pension, being two years short of retirement. 
Upon hearing of her fate, Gerry goes to Bayles to apologize for her actions, and their end result. An apology which Bayles accepts. Meanwhile, Dade has contacted another one of Bayles' former pupils, Gavin Gordon, who has risen to become President of the United States. Gordon is on a tour of the country and is in the area of his old hometown. After Dade also apologizes to Bayles, the President arrives at the school and delivers a sentimental speech extolling the virtues of the education profession, motherhood, and Mrs. Bayles. Her job is saved.

Bayles' former pupil