Caveat
Only a fraction of polls are published and an even smaller fraction are easily attainable. For example, when you see in the paper "according to a Gallup Poll published last week" it is not guaranteed that you will be able to find the poll in one of our services. Also, many marketing polls/surveys are prohibitively expensive and therefore in effect not available.
Search the library catalog for subjects such as "Public Opinion" and "Public Opinion Polls".