hey all,
i can comiserate, being frantic about not getting into wash u, also my top choice, but good luck came and i was accepted!
so, in order to help out my ex-fellow waitlisters, here's what my pre-med advisor said about wash u. she said since wash u is a midwestern school and it loses so many people to east/west coast schools, it seems to especially want numerous reassurances that you would go if accepted. i sent in a letter of intent before i was decisioned and an update letter in april. if you have anything new to say then definitely send a letter. so that's the word from my advisor (at jhu, if that matters).
good luck!