The ISSR Data Archive maintains a collection of public opinion poll data, covering many years and countries. Some of these files come from the Roper Center. Some come from Inter-university Consortium for Political and Social Research (ICPSR). To see what is available on campus, click on this link:
http://www.sscnet.ucla.edu/issr/da/index/unclassified_public_opinion_polls.htm

For more information about getting polls from the Roper Center, click: http://roperweb.ropercenter.uconn.edu/

For more information about getting polls from the ICPSR, click: http://www.icpsr.umich.edu