He regresses the Logarithm of the voting ratio of Buchanan on the Logarithm of the voting ratio of Gore. I don't intend to discuss that issue here. To begin the analysis I replicated LNP and achieved results that differ only by what I consider to be rounding error. The major assumed advantage of the LNP model is that by analyzing voting ratio instead of voting count, the model doesn't have a problem derived from dealing with different sizes of counties. Let's remember it was assumed there was no relationship between these two, and that this assumption is the major driving force behind doing an analysis on ratios on the first place.
Palm Beach seems to be an outlier in yet a different specification of the model.
Preliminary results that indicated otherwise were an artifact of the fact that the regression was not incorporating a highly predictive variable.