Holy Crap

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Did not expect that.

Snowden on Thursday? Or can he even be pardoned, since he hasn't been convicted (or even tried)?

Yes, the POTUS can pardon for crimes that a person has for has not been charged for. Ford pardoned Nixon for all crimes against the US.

"Now, Therefore, I, Gerald R. Ford, President of the United States, pursuant to the pardon power conferred upon me by Article II, Section 2, of the Constitution, have granted and by these presents do grant a full, free, and absolute pardon unto Richard Nixon for all offenses against the United States which he, Richard Nixon, has committed or may have committed or taken part in during the period from January 20, 1969 through August 9, 1974."
http://www.presidency.ucsb.edu/ws/?pid=4696