I can't really speak of Cooley since I know nothing about it other than its reputation.  Personally, the one thing I'd worried about with a school that admits people with both bad GPAs and LSAT scores would be that the student body would actually hold back my education because they'd have a harder time grasping the material.  But I don't know if that is even the case.

I was going to recommend you go to http://officialguide.lsac.org/

I typed in your 2.9 GPA and 156 LSAT and found you have up to a 100% chance of getting admitted to at least 11 different schools and still a greater than a 50% chance of being admitted to dozens more.  You are not limited to Cooley.  You would be limited to Cooley if your numbers were 1.9 and 146 instead of 2.9 and 156.

Are you committed to a specific school or a specific area?  If not, that increases your odds.  Take the LSAT and apply to every school that gives you a fee waiver.  I have a 2.75 GPA and a 165 LSAT and I've been offered a full ride to a school I never would have applied to if not given a fee waiver.