Mystery Plant!

Well I have finally found out what the mystery plant is thanks to some help from the wonderful people at WildlifeGardeners.org .

Its Smilax herbacea (Carrion Flower)

The plant is over 5 ft and has fallen over. It grew probably 2-3ft just this week.
I dont know if its native or not yet but i'm going to look into it.

EDIT: I just got an email from Minnesotawildflowers.info and there are 4 species of smilax in MN and all are native. so yay! another native plant