Key points are not available for this paper at this time.
This work is the only complete compilation of polls taken by the Gallup Organization, the world's most reliable and widely quoted research firm, in calendar year 2013. It is an invaluable tool for ascertaining the pulse of American public opinion as it evolves over the course of a given year, and-over time-documents changing public perceptions of crucial political, economic, and societal issues. It is a necessity for any social science research.
Cummings et al. (Mon,) studied this question.