The President's statement says it all. A pardon would have been better to address the out-of-control special prosecutor's pursuit of someone who had no connection with the leak itself. The leak, as we now know, was from Armitage - and it was an effort to expose the lies of one Joe Wilson and possible neptism on the part Valerie Plame.
Still, it is a start. One can hope that the pardon will come at an appropriate time.