Well they have to deny it, but why would he lie?
Check it out:

Now that comments by Obamacare architect Jonathan Gruber have entered their fourth day of dominating the non-network news cycle, the White House allied Center for American Progress is beginning to push back by claiming Gruber is simply wrong. But is CAP correct about what Gruber said or are they misreading him?

CAP President Neera Tanden has a piece in the Wall Street Journal which promises to get to the bottom of Grubergate. “Mr. Gruber’s comments in 2013 that the law passed only because of “the stupidity of the American voter” and a “lack of transparency” by the Obama administration are simply incorrect,” she writes.