It appears I'm more or less in the same boat as the OP, with slight differences. Just graduated, 3.65 GPA from decent lib arts college, A in stats, econ/IR majors, but didn't have to take calc, which I'm now regretting. My GRE scores were lower though, 620 V 710 M 5.5 AW. Work experience- no full time, but 3 internships, including congressional office, and NGO in Spain. Other qualities would include studying at the LSE for a year, foreign language proficiency, some research and some volunteer work.
Any predictions? I'm not feeling so great about my chances, although the general consensus amongst Harvard grad students seems to be that HKS is the 'easier' school to get into and where all the H law rejects want to go.
p.s. If WE is so important to the MPP- why wouldn't most applicants with significant WE go for the MPA/ID or MPA2? Although their website does say the average student has 3 years of WE in the MPP...just wondering what the specific difference is.