Reduviidae, Phymatinae, Phymata sp. and looks like being Phymata americana. You are correct with Assassin Bug, yours is from this family. Yours is actually an Ambush Bug.
http://bugguide.net/node/view/214040/bgimage
http://bugguide.net/node/view/214042/bgimage
http://bugguide.net/node/view/24975/bgimage
http://bugguide.net/node/view/64424/bgimage
http://bugguide.net/node/view/348342/bgimage?from=0
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