Cooking there is no evidence of that at all. Doesn't seem to be any hostility from either side, well except for a few message board posters and political pundits, but thats to be expected.
No evidence that he knew about the stimulus plan and the census? No chance that he would have served the country more effectively as an Administration insider?
If he discovered that perhaps he was going to be just a marginal player in the Administration or not be let in on certain things, that's a good reason. Quitting over things that he had knowledge of prior to accepting the position is not.