undergrad law major
I think that pre-law is not exactly favorable to law schools. In other words, most law schools like to see diversity. So if you are a biology major, chemistry major or anthropology major...this might be looked upon favorably on your application. Personally, I think that an economics, international affairs, or statistics background is what most law schools are primarily after. Engineering is not a bad field either.
The reasoning behind this is to encourage broad discussion in the classroom. It wouldn't be that interesting if everybody only studied law before coming to law school. After all, that is the purpose of law school.