American University School of Public Affairs Professor David Barker's research has led to several conclusions about the future of political discourse in the U.S. The first is that dueling fact perceptions are rampant, and they are more entrenched than most people realize. Some examples of this include conflicting perceptions about the existence of climate change, the strength of the economy, the consequences of racism, the origins of sexual orientation, the utility of minimum wage increases or gun control, the crime rate and the safety of vaccines.