Tom Maguire's Just One Minute is linked above.
Day by Day, the Right's Doonesbury, mentions it here:
And I think that I found the George Will column Sagar mentioned in his article, and which Maguire was looking for. Here's Sagar's mention:
"We had a scare," [Sean] Treglia [who coordinated the Pew Charitable Trusts' effort] says. "As the debate was progressing and getting pretty close, George Will stumbled across a report that we had done and attacked it in his column. And a lot of his partisans were becoming aware of Pew's role and were feeding him information. And he started to reference the fact that Pew had played a large role in this — that this was a liberal attempt to hoodwink Congress."
Check it out.