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1.
Someone who spreads untruths, such as a politician spreading rhetoric and hyperbole and passing it off as the truth.
George W. Bush, Ken Mehlman, Scott McClellan
by Roland99 July 14, 2005
 
2.
a person who disseminates messages calculated to assist some cause or some government
Michael Moore is an overweight propagandist.
by Unvill September 24, 2004