def compare(self, first, second, chamber, type='votes', congress=CURRENT_CONGRESS):
        """
        See how often two members voted together in a given Congress.
        Takes two member IDs, a chamber and a Congress number.
        """
        check_chamber(chamber)
        path = "members/{first}/{type}/{second}/{congress}/{chamber}.json"
        path = path.format(first=first, second=second, type=type,
                           congress=congress, chamber=chamber)
        return self.fetch(path)
See how often two members voted together in a given Congress.
        Takes two member IDs, a chamber and a Congress number.