13. The method of claim 1 , selecting a subset of candidate answer sources, from a group of candidate answer sources, based on a ranked listing of candidate answer sources, further comprises: generating priority values associated with candidate answer sources in the group of candidate answer sources based on one or more prioritization criteria and ratings associated with the candidate answer sources in the group of candidate answer sources, wherein the one or more queries are applied to the subset of candidate answer sources according to priority values associated with candidate answer sources such that the one or more queries are applied to higher priority value candidate answer sources first before applying the one or more queries to lower priority value candidate answer sources.
14. The method of claim 13 , wherein the subset of candidate answer sources comprises candidate answer sources in the group of candidate answer sources whose priority values meet at least one predetermined priority level.