Well, Trump got a lot of mileage out of “Lying Ted.”
Never “misunderestimate” the power of the simple.
And frankly, heartless is a very perceptive way of viewing the modern Democrats. In trying to ride everybody to care about everything, they end up with nobody caring about anything except their own narrow self interests — exactly what they viewed the right as doing. There are no sane priorities in such a worldview, only knee jerks and accusations.
With clarity comes simplicity. "heartless hillary" is perfect. I've NEVER heard her say anything that indicates that she cares at all about the feelings or the well being of others.