In the real world
Two prospective employees are applying for the same position. One has a university degree, the other does not.
Both of these candidates have the experience and ability to do the job, and the prospective employer considers both candidates equally acceptable for the position.
Who do they hire?
More likely than not, the one with the college degree.
The same could be said, to some extent, for voters (prospective employers) who are electing or "hiring" a President (prospective employee).
The difference is that at the private employer, most do have a college degree. In the analogy of America, 67% do not have a Bachelor's. Can't find the data for the voting age population, but I wouldn't be surprised if it is a near majority. In a democracy, people like people they can relate to. That's how Bush happened.
EDIT: Found it from 2012 results. 53% of voters do not have a Bachelor's or higher.