Richard Petty, Distinguished University Professor of social psychology, researches the situational and individual difference factors responsible for changes in beliefs, attitudes, and behaviors. He joins host David Staley on this week's Voices of Excellence on Soundcloud and iTunes to discuss his recent work on how political partisans (those who strongly identify as liberal or conservative) differ from independent voters in the overall strength of their attitudes. He's found that independent voters often have greater animosity toward one candidate than they have liking toward the candidate that they were going to vote for, and this negativity is growing.