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Republican Nikki Haley is hoping to succeed Mark Sanford as South Carolina governor. She is the front runner, picking up endorsements from Sarah Palin, Mitt Romney and many others. But her campaign has suddenly been rocked by allegations of an extra marital affair, charges she strongly denies. Temple psychologist Frank Farley, an expert on risk taking, says politics draws a "type T" personality — the T stands for thrill seeker. According to Farley, they are often natural, charismatic leaders, but there is a downside. "The T negative is where they take risks in destructive ways. You may be changing the world, but you may also have that negative potential," Farley said.