I just noticed that John Zvesper’s "Political Philosophy and Rhetoric: A Study of the Origins of American Party Politics," is back in print (paperback) from Cambridge. Pricey, but worth it. Also note that the, what to call it, less philosophical--and more readable--version of it, called "From Bullets to Ballots" is avaliable here for free (note the good documents section as well).
A handsome volume landed on my desk yesterday (also from Cambridge) by Colleen Sheehan: "James Madison and the Spirit of Republican Self-Government". I read about twenty pages into it and then had to force myself to put it aside (to go back to Lincoln) because it was so enticingly written I was afraid that, out of control, I would read it all now. It’s hard to be moderate sometimes. You should look at this book as soon as you are able to allow yourself pleasure.