Ben Smith on Obama competing in more states and stretching McCain:

Obama can, for instance, run a real campaign in places like Texas and Arizona states that an occasional poll suggests he could win but where few observers give him much of  a shot. Then McCain has to decide whether to simply ignore it, and risk an upset; or to spend money on television and organization keeping up, money that then can't be spent in Ohio.

A smart colleague pointed out to me yesterday that Obama will try to do to McCain what he did to Clinton in Pennsylvania: Even as he lost the state, he ruined her by forcing her to keep up with his massive spending

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