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Phidippus sp.
Jumping spider
It could be a male Regal Jumper as well. I don't see the iridescent hairs on the abdomen but it could be an angle/light thing.
There is a comparison if you scroll down the page:
http://bugguide.net/node/view/2006
I agree with Cindy. This is a tough one.
This MIGHT be the Bold Jumper but I cannot say for certain with these two images. Definitely Phidippus with the green chelicera. Beautiful!