Allan G. Bogue has long been known as one of the country's foremost quantitative historians.... Using highly sophisticated methods of scaling, sampling a great variety of roll calls on many different subjects, he has proved the existence of substantial differences between radical and moderate, and certainly between radical and conservative, Republicans during the period in question.... Bogue has given us an excellent quantitative analysis of the politics of Civil War senators.(Journal of American History) In this important and well-written volume, Allan Bogue examines radical and conservative Republicanism in the Senate during the 37th Congress (1861–1863), documenting distinctions among the members and clarifying the factors that affected factionalism.... He effectively combines quantitative research with that in more traditional sources in a work that will serve as a model of its kind.(American Studies) The core of this study is analysis of the roll-call voting record, but extensive context is supplied in evaluation of biographical, institutional, and ideological elements. Bogue makes explicit his belief that 'quantitative research can be most effective when combined with research in so-called literary sources.' His presentation brilliantly demonstrates that he has acted on his beliefs.... The finished work is as much a guide to important research methods and a surpassing example of scrupulous reporting as it is a penetrating analysis of a dominant concept in Civil War history.(Civil War History)