It's not essential that you start here, but it helps to have some background information on your topic.
Remember: you can find pro/con essays from reputable sources on a wide variety of topics. These essays provide citations and a bibliography of other sources to consult as well.
These newspaper databases draw on a large number of newspapers, magazines, and other widely-distributed news sources.
Browse these reputable sources for up-to-date news on politics and policy in the United States.