you can write an addendum to explain and schools will look at your grade trends. In Montauk's book, a few adcoms were quoted as saying that if an applicant had say, a 2.0 in the first two years and then a 4.0 in their last two years ... that they would mostly consider the last years ...
but truthfully, I think your LSAC GPA matters a lot. A school's ranking depends a lot on its 25/75%iles and that ranking = $$$ ...