I can tell you that I'm pretty sure it's a Skimmer in the Genus: Libellula. The problem is it is a little far and the angle doesn't show the wings well (which may help a little). Without more detail is hard for me because there are a number of them in this group that look almost the same. For example:
Golden-winged Skimmer
http://bugguide.net/node/view/114602/bgpage
Bar-winged Skimmer
http://bugguide.net/node/view/208056/bgimage
Slaty Skimmer
http://bugguide.net/node/view/265360/bgpage
Great-Blue Skimmer
http://bugguide.net/node/view/191832/bgimage
to name a few.
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