Fightin' Words

A woman who loved a good fight
Would demand, as she argued all night,
Philosophical heft
From those on the left
And empirical proof from the right.

A recent walk through the economic blogosphere left the impression that liberals (of the progressive variety, as in this randomly selected post by Paul Krugman) like to base their arguments on data, history and "whatever works;" while conservatives (particularly of the supply side or libertarian variety) seem to prefer philosophy, game theory, analogies or even the US constitution - anything but empirical studies.