Mr. Greenberg talked about his book The Two Americas: Our Current Political Deadlock and How to Break It, from Thomas Dunne Books. The author suggested different ways that both Republicans and Democrats can bridge their ideological differences through better appeals to their core constituencies. He analyzed different demographic groups and their voting trends, discussed the hot-button issues for the current election, and talked about both presidential candidates and their campaigns. Following his remarks, Mr. Greenberg responded to questions from audience members.