I'd say that most larger law firms don't look at anyone from outisde the 100 of the
US News rankings. Outside the top 20 or so, you'll more likely to get jobs in the metropolitan area of the school than be able to go to NY, DC, Chicago, etc. That said, a large LA law firm will hire top students from local schools like Pepperdine (#88) and Loyola (#65). And SF Bay Area firms hire students from local schools like Santa Clara (#87).
So it depends on what you mean by "mid-level" and "low-level". E.g., to Stanford grads, schools outside the top 10 are "mid-level". (As an aside, I know a guy who transfered from Columbia Law (#4) to go to Yale Law (#1), because he didn't think Columbia was ranked high enough.)