Private schools have a big advantage over public schools, generally speaking. Of course in the flagship state is usually considered "great" by people in that state, but you leave the state and your school is only known if they're good at football or basketball, and even then they're only known for football or basketball. Interestingly, there seem to be a lot of schools which have "good" (according to US News anyway) law schools that don't have good undergrad programs -- Fordham, GW, American, GMU, Minnesota, Alabama -- I would guess these schools are not highly regarded according to lay perception (though GW may be an exception). However, there aren't as many schools that have very highly regarded undergrad programs with inferior law schools -- all I can think of is Wake Forest (I know it's undergrad is around #25 and law is around #40) so might be hard to make any conclusions about these schools.
1. harvard2. yale3. stanford4. georgetown5. columbia6. duke7. berkeley9. notre dame10. vanderbilt11. cornell12. ucla13. virginia14. michigan15. nyu16. penn/ penn state17. emory18. northwestern19. gw20. usc21. texas22. unc23. tulane24. bc/ bu25. u. chicagoBasically take US News list for undergraduate schools. Then add point for having an expensive, prestigious sounding private school name (see "cornell," "vanderbilt," "tulane," "berkeley"), deduct major points for sounding like a state school (see "u. chicago), but deduct less points if the school is a state or private school that sounds like a state school with a catchy moniker ("ucla" "unc," "nyu", etc.). Add points if school has good sports programs (notre dame, duke), but deduct points if more people think of it as PRIMARILY a sports powerhouse (michigan, usc, texas). Add a few points if the word "Boston" is in the name, because Boston sounds prestigious. Viola, the list.