This explains a lot
By 
Why does Michelle Malkin hate James Madison?
Of course, it must always be noted that James Madison — though he eventually advised in favor the Bill of Rights — was not the first to suggest that one be written, and his support for it was more or less intended as a sop to those who objected to its exclusion from the original draft of the Constitution. As Madison himself lukewarmly explained in June 1989 1789, “I will own that I never considered this provision so essential to the federal constitution, as to make it improper to ratify it, until such an amendment was added; at the same time, I always conceived, that in a certain form and to a certain extent, such a provision was neither improper nor altogether useless.”
To be fair, though, neither Madison nor anyone else could have imagined how crucial the Bill of Rights would eventually prove to be. I’m not sure what Malkin’s excuse is.