added sum aggregation
added sum aggregation

thecartercenter/elmo,VIP-eDemocracy/elmo,VIP-eDemocracy/elmo,CoolestNerdIII/elmo,CoolestNerdIII/elmo,thecartercenter/elmo,nmckahd/AHDBurundi,CoolestNerdIII/elmo,nmckahd/AHDBurundi,nmckahd/AHDBurundi,thecartercenter/elmo,VIP-eDemocracy/elmo