P. J. Markie has posted Political Obligation and the Particularity Problem (Ratio 22 (3):322-337) on PhilPapers. Here is the abstract:
Natural duty theorists of political obligation try to base a moral duty to obey the law on some natural duty, such as the duty to promote justice. Their critics say they confront an insurmountable obstacle in the particularity problem: Since natural duties do not bind us to some persons and institutions more strongly than to others, they cannot support a duty to one particular state or society. I solve the particularity problem, by developing a version of the political obligation thesis, giving a natural duty argument for it and showing that the particularity problem does not arise for the argument. I reply to some likely objections to my view.