Fergus M. Bordewich, a journalist and historian, has written America's Great Debate , a book about the sectional compromise of 1850 that preserved the union without bloodshed, for another 11 years, anyway. Describes John Calhoun thus early on: "A nominal Democrat through most of his political career, in 1847 Calhoun proposed the formation of a new southern party founded on four principles: that new territories clearly be declared the common property of all the states; that Congress be clearly denied the right to enact any law, or undertake any act, that would deprive a state of its 'full and equal right' in any United States territory; that any law barring the citizens of any state from carrying their property into any territory was a violation of the Constitution; and 'that people have the unconditional right to adopt the government which they think best calculated to secure their liberty, prosperity, and happiness.' This last was a virtual invitation to se...