Researchers at the Positive Psychology Center at Penn University have determined that in the past 100 years, the most optimistic candidates have won more than 80 percent of presidential elections. The reason why voters prefer optimistic candidates could be that they inspire hope.

With regard to the current candidates, the psychologists find Barack Obama and John McCain to be equally optimistic and Sarah Palin slightly more optimistic than Joseph Biden.

To read more about the study go to: http://www.upenn.edu/pennnews/article.php?id=1452