For the most part, entrants into the political race for President, whose only experience in office is within the legislative branch, are not prepared to understand or assume the role of President. A person who has been governor of even a modest sized state is much more prepared for the challenges and duties of both campaigning for and serving as President.
The fact that Herself was probably the most capable and proactive member of the regime of the "Former Occupant of the Oval Office, 1993-2001" puts Herself in good stead with those who confuse the exercise of power with an illusion of good judgment, but does not mean that Herself learned much about leadership during the interregnum.
The Clinton's know exactly what they are doing. They are still the shrewdest operatives in the Donkey Party, and will do what it takes to get the nomination. After getting the nomination they will start shunning most of the deluded nutcases who helped them get the nomination. Typical Clinto m.o. Get support from certain people, and when they are no longer needed, stab them in the back and/or dump them.