Do any schools offer teaching or research assistantships via distance education?
Graduate study is learning to do research, by working with your advisor and a research group, mostly hand in hand. A small part of that you'll be able to do remotely, but a minority in any case.

Perhaps you can find a job as a TA for some of the online courses, but if I was to select somebody to assist me in this, I'd select somebody I know personally (and even have at hand for coordination or to pull their ears if something goes awry).