I was in a similar situation when I applied to law schools over the past year. My undergraduate GPA was below a 3.0 but I just finished a PhD in Molecular biology.
I found that there is no good answer to your question. Different schools treat graduate work in different ways. Stay away from schools that use absolute GPA cutoffs - they won't look far enough into your application to find your graduate work.
In general, the rest of your application has to make up for this one glaring problem. Great LSAT scores, stellar letters of recommendation, and strong essays are all a must. Also, confront your undergrad grades directly. Acknowledge they exist right up front and tell them that based on what you have accomplished since then that they are not a good measure of your potential as a law student.
As for schools to apply to? I applied to 15 different schools all over the spectrum in the top 50 (USNWR). There is hope, I got into 2 of the top 10 schools and a smattering of other schools down the list.
I hope this helps