...onstitutional party — was composed chiefly of Democrats, but largely interspersed with Whigs of the stamp of Wm. B. Reed of Philadelphia, Robert C. Winthrop of Massachusetts, Reverdy Johnson of Maryland , Wm. B. Crittenden, and the like. In partisan parlance they were called Copperheads, and they were reinforced in the debates, though generally opposed in the votes, by a class of men who had split...