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Phidippus sp.
Nice find. Judging by the way the color shows on the abdomen, I feel pretty confident that this is Phiddipus audax, Bold Jumper. Scroll down on the P. audax Bugguide page and they show a comparison of how the abdomen looks between P. audax and P. regius.
There are a few Phidippus jumping spiders that are very similar and difficult to ID. For example Bold Jumper ( P. audax) and Regal Jumper (P. regius)
http://bugguide.net/node/view/2006/bgpag...
http://bugguide.net/node/view/6790/bgpag...