"Best qualified" depends on time and circumstances, of course.  Hillary has a superior temperament and the proven ability to work doggedly with well-chosen assistants to solve important problems.  In that regard she is like Barack Obama.  Hillary is strong on policy, smart enough to see the outcomes of competing policies, and progressive enough to choose policy that is best for the general citizenry.  She is skilled in law, politics, diplomacy, and administration.  Hmm - that puts her right up there with the best.

Since his latest foul-up, flip-flopping on illegal residents, I think there is a good chance Trump won't make it to November 8, either from being ousted or by resignation.  I notice that JEB! is standing in the wings, waving YOOHOO!  Reince Priebus might hand Trump the Black Spot.