This week, Fred Thompson's out-of-print 1975 memoir, At That Point in Time: The Inside Story of the Senate Watergate Committee, is listed for as much as $300 via Amazon's used-books feature, indicating to some extent his growing popularity in the race. Barack and Hillary hold strong as the J.K. Rowlings of their peer group. Giuliani surges into Tinkerbell territory. Romney slips into Unabomber-like insignificance. And the release of Sam Brownback's new book vaults him into Amazon contention.