Woodward also said in his testimony that earlier he had told Pincus. Chances are he would have told Pincus when he was writing about Joe Wilson (I believe in his earlier articles he didn't specifically name Wilson but Pincus knew who he was and chances are Woodward did too, so this would be a month to two months before the June interview). This falls in line with what Andrea Mitchell said, and others have said as well. That is was common knowledge.
Except that Woodward said he wasnt told by his administration source until mid June.