I don't think it's the identity database, it's the A/B testing of their message available with Facebook to allow rapid pushing of the message. But I think the result is clear, the net has now become the main electoral media.
An identity database of voters like described here by the Google's CEO?<p><a href="https://wikileaks.org/podesta-emails/emailid/37262" rel="nofollow">https://wikileaks.org/podesta-emails/emailid/37262</a>