I received a call on my home phone on Jun 27, 2015.  Caller ID said HFACC INC.  I did not answer; they did not leave a message.  Here are the results of an internet search of HFACC INC:

Hfacc, Inc. is a Florida Foreign Non-Profit Corporation filed on April 17, 2015. The company's filing status is listed as Active and its File Number is F15000001695.

The Registered Agent on file for this company is C T Corporation System and is located at 1200 South Pine Island Road Plantation, FL 33324. The company's principal address is 300 Cadman Plaza, 11th Floor New York, NY 11201 and its mailing address is 300 Cadman Plaza, 11th Floor New York, NY 11201.

The company has 4 principals on record. The principals are David Levine from Brooklyn NY, John Podesta from Brooklyn NY, Erin Stevens from Brooklyn NY, and Jose Villareal from Brooklyn NY.

AND

Hfacc, Inc. is a New York Domestic Not-For-Profit Corporation filed on April 1, 2015. The company's filing status is listed as Active and its File Number is 4735306.

The Registered Agent on file for this company is Perkins Coie LLP and is located at Attn: Richard Ross 30 Rockefeller Plaza 22nd Flr New York, NY 10112-0085. The company's principal address is Perkins Coie Llp attn: Richard Ross 30 Rockefeller Plaza 22nd Flr New York, NY 10112-0085.

"This is the brand and trademark page for HILLARY FOR AMERICA which was created on April 13th, 2015 by HFACC, Inc., an non-profit corporation. The trademark owner is located at 120 West 45th Street, Suite 2700 in New York, NEW YORK. HFACC, Inc." --according to Trademark Hound.

I received calls from HFACC Inc Nevada where caller did not leave message. The company is also registered in Nevada and has an active registered listing agent in Carson City
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775-771-3771 is the number on caller id. If you call the number back, there is no answer and eventually a recorded message stating that the voice mail account has not been set up.

HFACC called me and left no message, the number they called from is 1-702-912-8267. I give unknown numbers two chances to leave a message, otherwise, they will be blocked. I do not appreciate unsolicited callers not stating their intention for calling and will not be harassed by unknown strangers.

All of that research and not one time did you see that it's the Hillary for America Campaign? Man, your google must be really outdated! LOL. Just a joke...But the call is safe. It's just Hillary Clinton's campaign calling to see if they can count on your vote for the election and if you have a ride or they can schedule a ride to the polls for you.

They call and call, do not leave a message.
Yes  it is the Mrs. Clinton for President once we look it up.
Still, to call and call with robo calling and not leave any message? Call it what it is.