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American National Election StudiesANES (American National Election Studies) is a survey conducted by leading scholars of political behavior of voters during each general election. This websites offers an archive of datasets from 1952 to 2008. All of the datasets are free.
Public Data Explorer- Google Labs"Play with the tool to create visualizations of public data, link to them, or embed them in their own webpages." Use data from the sources listed in data directory on the website, or upload your own. From Google Labs.
Data.gov"Find, download, and use datasets that are generated and held by the Federal Government."
These websites are mainly government and NGOs which provide in-depth information about the the social and economic situations of foreign countries.