These links are good places to get started on your topic.
CQ Researcher specifically covers "hot topics" and frequently debated social issues. Explore, follow related links, and pay particular attention to the pro/con arguments.
Academic Search Complete is a good general-purpose research database in which you can find a variety of sources -- news, academic articles, and others. Great for background research and finding facts and studies to back your position.
Make sure to check the dates on your sources -- there's nothing wrong with sources a few years old and the pro/con arguments are always useful, but if your source is a few years old make sure to find some current facts and figures to back them up.
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