Allow telephone canvassers to co-operate

Have you ever gotten multiple requests to vote for a particular candidate? Annoying, right? It is unavoidable because different organizations canvassing for a candidate use the same lists, but can't tell each other who they have called. It is even worse when numerous canvassers call the home of a recently deceased voter. We can ameliorate this problem by allowing political organizations to share canvassing results. This means fewer calls to a specific address, less hassle for the general public and more efficiency for canvassers.