Update: I received an e-mail from a reader who did not buy the ends/means argument, but Murray Rothbard sure did. From his essay “Left and Right: Prospects for Liberty” (1965):

Thus, with liberalism abandoned from within, there was no longer a party of hope in the Western world, no longer a “Left” movement to lead a struggle against the state and against the unbreached remainder of the Old Order. Into this gap, into this void created by the drying up of radical liberalism, there stepped a new movement: socialism. Libertarians of the present day are accustomed to think of socialism as the polar opposite of the libertarian creed. But this is a grave mistake, responsible for a severe ideological disorientation of libertarians in the present world. As we have seen, conservatism was the polar opposite of liberty; and socialism, while to the “left” of conservatism, was essentially a confused, middle-of-the-road movement. It was, and still is, middle-of-the-road because it tries to achieve liberal ends by the use of conservative means.

In short, Russell Kirk, who claims that socialism was the heir of classical liberalism, and Ronald Hamowy, who sees socialism as the heir of conservatism, are both right; for the question is on what aspect of this confused centrist movement we happen to be focusing. Socialism, like liberalism and against conservatism, accepted the industrial system and the liberal goals of freedom, reason, mobility, progress, higher living standards for the masses, and an end to theocracy and war; but it tried to achieve these ends by the use of incompatible, conservative means: statism, central planning, communitarianism, etc. Or rather, to be more precise, there were from the beginning two different strands within socialism: one was the right-wing, authoritarian strand, from Saint-Simon down, which glorified statism, hierarchy, and collectivism and which was thus a projection of conservatism trying to accept and dominate the new industrial civilization.

So, we’re down to choosing a candidate (Obama) that pursues liberal ends (freedom, reason, mobility, progress, higher living standards for the masses, and an end to theocracy and war) by statist means (statism, central planning, communitarianism) with the chance that he is open to liberal methods, or a candidate (McCain) who pursues statist ends (statism, hierarchy, and collectivism) by statist means.