Sigerson argues that the city should adopt ethical guidelines that preclude its politicians from accepting campaign contributions from companies that do business with the city. Sigerson' s proposal is dishonest, however, because he has taken contributions from such companies throughout his career in city politics. The reasoning in the argument is most vulnerable to criticism on the grounds that the argument ['rejects a proposal on the grounds that an inadequate argument has been given for it', 'confuses a sufficient condition for adopting ethical guidelines for politicians with a necessary condition for adopting such guidelines', 'rejects a proposal on the grounds that the person offering it is unfamiliar with the issues it raises', "overlooks the fact that Sigerson's proposal would apply only to the future conduct of city politicians"]