'All American Girl' starts with Sam getting caught selling celebrity portraits, which she creates in her German notebook. Her mother, an environmental lawyer, decides that if Sam is given an outlet for her creativity, Sam might get better grades in German. Her mother enrolls her into a drawing class taught by a well-known artist, Susan Boone. She is compared to an elf queen by Sam at their first meeting. The first art lesson goes horribly wrong when her art teacher states that Sam cannot "draw what she sees". Taking Jack's advice about 'fighting the system', she decides she does not want to come back to art class, especially since she embarrassed herself in front of the vaguely familiar David, another student in the class who seemed to pay attention to her—something Sam has not experienced before, because guys usually seem to think that she's weird. When Sam’s housekeeper Theresa drops her off for the next lesson, she waits until Theresa leaves before spending the duration of her art class in the next-door music store.
Sam notices a strange man listening to Billy Joel’s "Uptown Girl" over and over. She refers to him as Mr. Uptown Girl. When she leaves the music store, the President’s motorcade stops in front of the cookie store next door. The president (only referred to as Mr. President) walks into the cookie store. As she waits for her ride on the corner, Mr. Uptown Girl begins to pull out a gun, ready to assassinate the President. Sam instinctively distracts the man, breaking her arm in the process. Sam is immediately treated as a hero for saving the President's life. When Sam is allowed to meet the President and the first family, she realizes why David looks so familiar: he is the son of the President. When she is invited to dinner with the first family, she is given the title/job of 'teen ambassador of the United States'.
Sam's confusion about her relationship with Jack and David ensues. In her own mind, she loves Jack, but she is really falling for David.
Sam is then invited to a party hosted by a girl who used to be friends with her but is now horrible to Samantha. She doesn't want to go but her best friend Catherine asks her to because of Catherine's new boyfriend - Catherine wants her boyfriend to think that she is popular - and to see what a popular person's party is like. Sam agrees and invites David. Secretly, although she won't admit it, she is just going to make Jack jealous. However, David sees through this and tells her how hurt he feels - 'I thought you were different.....you were [just] using me to make that Jack guy jealous'.
As teen ambassador, Sam is a judge for a painting contest which Jack enters.
Lucy helps Sam realize that she made a horrible mistake and she finally starts to notice that she was or had been falling in love with David and not Jack. Sam sees David from afar at the meetings she has to attend as teen ambassador. In art class a few days later David just acts like he did before, the same way as the first day she was in the art class. David passes a note wondering if they were still friends, to which Sam replies that she wants to be more than friends. David is shocked with this and asks about Jack, Sam replies with "Jack who?" The last note David passed had a heart on it letting Sam know that David loves her.
The conclusion is a week later letting readers know that Sam and David are together.
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