He entered USC as a highly regarded quarterback prospect .
Booty spent his first three years at USC as the back - up to eventual Heisman Trophy winner Matt Leinart , who had replaced former Heisman winner Carson Palmer .
Although he entered USC as a highly regarded quarterback prospect , Booty spent his first three years at USC as the back - up to eventual Heisman Trophy winner Matt Leinart , who had replaced former Heisman winner Carson Palmer .