Spencer R. Weart, The Discovery of Global Warming (Harvard 2008)
An interesting an well-written history of climate science and policy.
Volume 1 of David P. Currie's masterful The Constitution in Congress: The Federalist Period: 1789-1801 (Chicago 1997).
I am also still keeping at Anthony Powell's A Dance to the Music of Time, which I nearly abandoned. I still do not feel completely gripped by the work, but I am increasingly enjoying it.