Joint Session of a Two-Party Congress
The United States Congress is an example of a two-party system of governance. In this picture, Obama's Health Care Speech is being given to both the House and the Senate.
Source
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"Obama Health Care Speech to Joint Session of Congress."
http://en.wikipedia.org/wiki/File:Obama_Health_Care_Speech_to_Joint_Session_of_Congress.jpg
Wikipedia
Public domain.
