I would leave. I would work either part-time or temp for a bit more and then lump this 8 months into that "whole" (previous temp right through as if you have been, what does my resume call it? "Independent administrative assistant contractor or part-time employee with clients including. . .") and then I just give the basic industry, "engineering firm, nonprofit Federal training center operating out of the University of Maryland, Realtors, accountants, arts association, hospital management training consultants, residential school."

True, I did not work for a temp agency but you can put the temp agency name and then go through the types of people you worked for while with them and do the "senior vice president of a mid-sized corporation" line without naming the corporation or how long you were there :-) You did originally get the job from the temp agency so you aren't lying. Just give someone in the temp agency you know/like and who likes you on any form for "boss" and go from there.