Via Matt Yglesias, The Economist has a weird endorsement history. They went Reagan in 1980, nobody in 1984 and 1988, Clinton in 1992, Dole in 1996, Bush in 2000, Kerry in 2004. The Economist is by definition, libertarian-ish, so it looks like they basically endorse Republicans unless the Republican incumbent has screwed up (1992, 2004). That’s the only real patten I can see, although the fact that they didn’t endorse George H.W. Bush in 1988 sort of shoots that down.