I'm starting to appreciate that this really isn't one book, but a mash-up of three related ones. The first is a study of ethnic politics in (primarily eastern) Massachusetts in the late 19th and 20th centuries. The second is a history of the House of Representatives form the 1910s to the 1980s. The third is a history of national politics from the 1920s through the 1960s. All of these aspects are relevant to McCormack's life, but the author doesn't do the best job of interweaving them together and loses sight of his subject in the process.