The language of political discourse abounds in metaphors and laments. The general tendency to make abstract ideas more intelligible by expressing them through concrete analogues accounts for the former. The latter are most commonly the reaction to disenchantment with conditions that have failed to come up to expectation.
From the dictionary definition of a metaphor as “the figure of speech in which a name or descriptive term is transferred to some object different from, but analogous to, that to which it is properly applicable” (OED), it follows that the function of a metaphor is to express similarity rather than identity. In practice, however, the degree of similarity implied by a metaphor has a wide range of variation from the most far-fetched comparison to so nearly complete an identification that it is difficult to distinguish the metaphor from a literal description. Thus, for example, a fringe of organismic thinkers—though not the mainstream of political organicism as T. D. Weldon has suggested—maintained that the state was not merely like an organism but was in fact an organism, and therefore imagined that the laws which control a biological organism should apply equally to the political or social organism.
Ambiguity may stem either from imperfections inherent in a particular metaphor or from lack of precision in establishing the extent of identification implied. In addition, the assumption of similarity between two objects or two ideas which have many, but not all, of their attributes in common may serve to withdraw attention from their unique attributes which, on occasion, may prove to be the most significant ones.