In a sane world, this would be a political kiss of death. If we lived in a country that valued veracity, honor, decency, and actual achievement, an endorsement from Harry Reid wouldn't help a presidential candidate's chances, it would destroy them. Unfortunately, we don't live in that world.
We live in a world where a creature like Reid - one of the most divisive, deceptive, and duplicitous Senators in modern history - can spend over 40 years sucking the taxpayer teat while getting rich in office.