Don't you have to be convicted in order to receive a pardon?
Apparently not.
In 1866, the Supreme Court ruled in Ex parte Garland that the pardon power "extends to every offence known to the law, and may be exercised at any time after its commission, either before legal proceedings are taken, or during their pendency, or after conviction and judgment."
Generally speaking, once an act has been committed, the president can issue a pardon at any time—regardless of whether charges have even been filed.
http://www.slate.com/articles/news_.../2008/07/preemptive_presidential_pardons.html
