In 
politics and 
public relations spin refers to portraying an event
or fact in a way that is favorable to you and unfavorable
to your political opponents. This is called "putting a positive spin on a story" or just "spinning" the story.
Practitioners of spin are often referred to as spin doctors.
The techniques of spin include:
-  selective quotation
 -  selective use of facts
 -  phrasing in a way that assumes unproven truths
 -  "burying" stories by releasing information at times when more important events dominate the news
 
Spin is effectively the techniques of "grey propaganda" applied to politics and PR.
See also:
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