I believe this is a moonseed vine, but if anyone can verify that would be great.
Cocculus carolinus? I usually think of moonseed as Menispermum.
Cocculus carolinus what I meant by MoonSeed. Ever look at it's seeds?
Due to the heart shaped foliage in the OP's picture, I think Thedecoguy named the right species...Polygonum. Possibly P. scandens?
Here is a link that might be useful: Polygonum scandens