It's not how famous your school is, it's how academically respectable it is. There are some famous schools which aren't as good in terms of academic reputation as some less known schools.
I consider Widener to be a tier 3 university, which means that it's okay. If you do really well there, and completely rock the LSAT, you stand a chance at some good law schools. If you really, really rock the LSAT - and I do mean top scores - you stand some chance at the elites.
It might also help if you do some really special things while at Widener, such as taking on some community leadership roles, or somehow getting involved in helping people in need in Philly, etc. Something that goes to Widener's core mission of community involvement, and takes advantage of their strengths in those areas.
I think you will get into a law school, if your grades are good and your LSAT is strong. But because Widener is kind of a tier 3 university, I'd want your grades and LSAT to perhaps be a bit stronger than those of other applicants, and for you to have done some really special things in college, in order to set yourself apart. Because it's not that Widener sucks, academically. It absolutely does not. But it's not stellar, and you're going to be up against stellar. So make sure you're in good shape re: the entire application.
Do those things, and you stand a really good shot at a decent law school.