There is a somewhat of a parallel with 2008. Then, the inevitable candidacy of Hillary Clinton was derailed by the emergence of Barack Obama, a gifted, intelligent young man who seemed destined to become our first African- American president. He was, perhaps, the only person who could have prevented her nomination.
Now, Hillary Clinton, with four years of stellar service as Secretary of State added to her prior outstanding record, is considered a lock for 2016 should she decide to run. Thus, she becomes an insurmountable roadblock to any aspirations of Joe Biden, who has been serving admirably and effectively as Barack Obama's vice president