He has a clear understanding of the history of US foreign policy, and how that is still impacting us today.
I really appreciate him bringing sanity -yes, finally, SANITY- into FP discussion into this election cycle.
I also have a degree in IR, and it strikes me that his FP philosophy might be a mix of mild Liberal Interventionism and Realism, which, in policy-making process, would translate as being a dove.

I hope when he gets into WH, he would have realists on his side so he could listen to them (Realist scholars like John Mearsheimer I really admire). The neocons must be cast out of Washington. They are simply wrong about everything. And if you don't cast them out, they WILL isolate America, and destroy it from within and without.
From FP perspective, it has to be Bernie, and he must have the sane voice surrounding him as well...