Always tricky to ID, since they change often their color depening on the flower there are sitting...
It might be Misumena vatia. Please, check yourself as well...
http://bugguide.net/node/view/779062/bgimage
http://bugguide.net/node/view/5621
And here the whole bulk:
http://bugguide.net/node/view/6751/bgimage?from=48
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