Whether they like it or not, Vice Presidents who run for president are invariably tied to their president. Mondale was tied to the feckless Jimmy Carter. Gore suffered from Clinton (even as he sought to distance himself from him). Nixon gained from the popular Eisenhower, and nearly won (eventually, he DID win). George Bush won because of the great Ronald Reagan. Biden will not be able to shake the disaster that is Barack Obama. For that matter, Hillary may have problems doing that too. Biden has as much a chance to become president as do my collection of toe nail clippings.
Roughly equivalent IQs!