Not everyone took Joe Wilson seriously. Many people, including most here at FR, believed all along that the truth was what it ended up being. It wasn't hard to figure out. Those who blamed the White House wanted it to be the White House's fault and let there desire shape their perception of reality. This pattern is observed over and over again among the liberals. They want so much to believe something that conforms to their worldview that eventually it becomes their reality.
To sum up, we were right all along and the Bush-hating left was completely wrong - as we said they were - all along.