You found
The official campaign website for Hillary Clinton is paid for by "Hillary for America" and found at 

Please ensure that your emails are addressed correctly or they will be delivered to the wrong place.

Please email us at for any inquiries about this domain name.

Note that on April 12, 2015, Hillary Clinton announced her candidacy for President of the United States of America.  There is a signup form to join the "official campaign" at the website listed above.