i wanted to know what school you're at now, but i'm not sure i want to drudge up anymore bad feelings for ya. but i do have some light at the end of your tunnel! depending on which state you're in and which firms you're looking at, what a lot of them look at are really your grades and your activities and what you tried to 'accomplish' so-to-speak in law school.
i worked for a big national firm here in phx a year ago and i asked one of the recruiters what they looked for in law students when they were hiring for either summer or perm positions. she said the main thing she looked at were grades, then activities (i.e. law review, moot court, etc.), then the school you went to although she truthfully told me they do look at rankings. but when i left in the summer (i was only doing a paid internship in a policy group w/in the firm), one of the summer clerks they had just hired was from a T4 on the east coast. also i was just looking at a firm in chicago's web site and i was seeing a lot of people from a regional T4 school in a big firm. so i hope this makes you feel better!