In response to an advertisement offering a free trial lesson in modern dancing, Galt, a graduate nurse, entered into a contract with the Modern Dancing Studios for 15 two-hour lessons for $350. Before she had taken all the lessons, the dancing instructor, Valentino, told her that she would become a wonderful dancer if she went on and that if she agreed to more lessons she would "probably get the bronze medal for dancing." On St. Valentine's Day, he gave her a rose, and in the course of a lesson whispered in her ear how wonderfully she danced. She eventually signed a second contract to take another 35 hours of dancing lessons for $650. A new instructor was then assigned to her, and all compliments and personal attention ceased. Galt brought action for rescission of the contract and return of the $650. 

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On what ground might such a contract be voided? Should the action succeed?