Remember that in addition to these subject specific databases, there are several good multidisciplinary databases linked under the "Multidisciplinary" subject heading.
PAIS provides documents on public affairs issues in many formats, including journal articles, government documents, statistical reports, and gray literature
CQ Researcher, published by Sage Press, present reports on important social and political issues. The reports are a good place to familiarize yourself with a topic and find further sources of information.