I like the title (James Madison: Federalist) . I am going to take this with me on the bus this am. Looks interesting. I admit I for whatever reason sort of "root" for Madison. I am much more sympathetic to him than I am to Jefferson. In my view, Jefferson was a bad influence on him. But I am going to try to be fair, not biased in Madison's favor, and see what I can learn. Thanks for the link.
Madison also takes his lumps in Rockwellite Di Lorenzo's articles. It seems he was too moderate for both sides. But such a moderate course was a good way, maybe the only way, to preserve liberty and build a nation. At first, Madison's idea of the extended republic looks like the beginnings of today's federal megagovernment. But I think you have to look at it in the context of his times. The alternative of keeping the states as separate little pools of absolute sovereignty would have been worse for the country and for liberty.
Madison is a very intriguing figure. The papers of Washington, Jefferson, and Lincoln have largely been digitized by the Library of Congress, the University of Virginia and the University of Michigan. Madison would be a good next choice, as would Adams or Hamilton.
Here's another article that addresses Madison's constitutional theory.