Did he think that nobody would notice?
In the hardcover version of Mitt Romney's book No Apology, Romney wrote that the economic stimulus by Obama was a good start, but not enough. Now, several months later, Romney's book is being released in paperback version, and Romney's take on the stimulus has been edited to the exact opposite. Now the stimulus was a bad idea to begin with.
And there are more examples.
It's a rather blatent attempt to appease the teabaggers at the expense of his own integrity and honesty. Way to go, Mitt.