The Donna Reed Show - Season 5 Episode 34 Day of the Hero
Overview: Jeff makes a date with Rosemary for the senior prom. Smitty then lets Jeff know that Jeff has been nominated to run for Senior Class President. Now gorgeous Dolores wants Jeff to take her to the prom. What can Jeff do? He's already committed to Rosemary, or is he? Will Jeff actually dump Rosemary for Dolores?