Seattle-based Mixpo, which provides an online video advertising platform for small and medium-sized businesses, said Monday that it has teamed up with the ad sales division of Comcast Cable, Comcast Spotlight. According to Mixpo, it will enable Comcast Spotlight to turn clients' existing on-air video advertising into online video advertising units on Mixpo. Financial terms of the deal were not disclosed. Mixpo's ad technology is used to serve and track video advertising.