If campaigns are zero-sum games, why will neither side talk about climate?

If campaigns are zero-sum games, why will neither side talk about climate? I’ve seen the justified lamentations about the lack of climate discussion in the campaign, and occasional discussion of why Obama hasn’t talked that much about it.  (I provided my own explanation – Ohio .)  There’s less discussion of why Romney doesn’t talk about it, and little about why the interaction between candidates doesn’t produce discussion

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If campaigns are zero-sum games, why will neither side talk about climate?