Second, Hillary Clinton is the prohibitive favorite to win the Democratic nomination. To win the presidency, however, she faces several, for lack of a better phrase, demographic obstacles.
In my cynical moments, I wonder if the American electorate is willing to elect the nation's first female president immediately after electing the first African American president. Further, since 1952, there has been only one time when a two-term president was succeeded by a member of his party.
Finally, Hillary Clinton is nearly 14 years older than Barack Obama. The last time Americans elected new president of the same party who was that much older than the predecessor was prior to the Civil War when James Buchanan replaced Franklin Pierce. Both were Democrats. Since then, when Americans have elected someone more than a decade older than the previous president, the new president has been of a different party. By the way, Democrats who support Bernie Sanders need to remember that he is six years older than Hillary Clinton.