If we eliminate President's running for re-election, we have: Nixon ('60, '68), HHH ('68), Mondale ('84), Bush ('88), and Gore ('00). I don't believe Hillary was more qualified than any of them.
Hillary: Senator for 8 years, Secretary of State for 4 years.
Nixon: Representative for 4 years, Senator for 2 years, Vice President for 8 years.
HHH: Mayor for 3.5 years, Senator for 16 years, Vice President for 4 years.
Mondale: Attorney General for 4 years, Senator for 12 years, Vice President for 4 years.
H.W. Bush: Representative for 4 years, U.N. Ambassador for 2 years, CIA Director for 1 year, Vice President for 8 years.
Gore: Representative for 8 years, Senator for 8 years, Vice President for 8 years.
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Kerry: Lieutenant Governor for 2 years, Senator for 20 years.
McCain: Representative for 4 years, Senator for 22 years.
Again, I don't believe Hillary was more qualified than anyone above the dotted line. Both McCain and Kerry had at least 2.5x more experience in the Senate, but didn't have the executive experience that Hillary had. Is 12-14 years in the Senate worth 4 years as Secretary of State? I don't know...I think that's a close call.