sentences:  Presidential candidates Barack Obama and John McCain participated in the debate.Otto delivered keynotes at the 45th annual Nobel Conference, on "Democracy in the Age of Science", at the United States National Academies, on "Examining the Mistrust of Science,", the New York Academy of Sciences, the EuroScience Open Forum (ESOF), the European Conference of Science Journalists, and countless other conferences and colleges and universities.He has discussed science and politics on National Public Radio's "Talk of the Nation