Rasmussen finished with a time of five hours, 59 minutes, four seconds, just ahead of Peter Sagan of Liquigas-Cannondale and Robert Forster of Team UnitedHealthcare.
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Riders made 10 circuits of a course of almost 15 miles from central Philadelphia to suburban Manayunk and back as well as several shorter loops before the final dash to the finish line.
In the women's Liberty Classic, current world champion Giorgia Bronzini of Colavita Forno d'Asolo finished the 57.6-mile course in two hours, 28 minutes, 28 seconds, ahead of Shelley Olds of Diadora Pasta Zara and Jennifer Purcell of Team Danbury Audi.
