The build and length of the abdomen are more suggestive of a skimmer than a darner, IMO. Great Blue Skimmer is what I was thinking, especially with the color and number of the node and stigma. Not sure on age/sex, but many Great Blues look like this during July-September. Here are a couple Great Blues for comparison:
http://bugguide.net/images/cache/3L6LLZELIZTZ2R3Z6RZHERZHPR0HMZZHIZZHKZ0HKZVL8RZHGRKH7ZCLRZDZJLWLKRDZHZ2LRZWLMZKHMR9LMRULIR.jpg
http://www.giffbeaton.com/Dragonflies/Great%20Blue%20Skimmer_2004-07-02_0049.jpg
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