World English Dictionary defines "spin" thusly:

13.informal to present news or information in a way that creates a favourable impression

President Obama is kind enough to provide us with an example:

President Obama on Monday announced plans to withdraw combat forces in Iraq, providing assurances that an Aug. 31 deadline will be met as the U.S. moves toward a supporting role in the still-fractured and dangerous nation. U.S. forces in Iraq will number 50,000 by the end of the month — a reduction of 94,000 troops since he took office 18 months ago, the president said in remarks to the Disabled American Veterans. The remaining troops will form a transitional force until a final withdrawal from the country is completed by the end of 2011, he said. ... "Make no mistake, our commitment in Iraq is changing — from a military effort led by our troops to a civilian effort led by our diplomats."

Only in the world of "spin" (or Orwell) would 50,000 troops be considered a "civilian effort led by our diplomats".