These resources provide data on attitudes and opinions:
Pew Research Center
Pew Research Center is a non-partisan fact tank that informs the public about the issues, attitudes and trends shaping the world. It conducts public opinion polling, demographic research, content analysis and other data-driven social science research, but does not take policy positions.
Roper Center For Public Opinion Research
Use this library database to find data from public opinion surveys administered since the 1940s. TIP: Search in the "SEARCHiPoll" tab, and then filter by "Crosstab(s)" to see more detail.