Aptitude test for President?

I have been once again thinking about our presidential choices to lead this fine country for the next 4 years.  As I was thumbing through the piles of political rhetoric looking for something tangible to evaluate the candidates on, it occurred to me that we have no good "standard of measure" for presidential candidates.  For folks like me, a president's ability to accomplish and lead is much more important that a bunch of political opinions on a variety of topics.

So, I would like to see the presidential candidates submit to a presidential aptitude test.   It would serve as the "data" equivalent of a debate.  The test would focus on their problem solving, intelligence, decision making (under pressure), economics, military strategy, and political science.  We could enlist former presidents and leaders of these fields to develop the test and have some portion of the government maintain it.  

It would also be interesting to see what some of the other attributes are of the candidates.  What is each candidate's IQ?  What is the most prevalent behavioral trait (DiSC profile)?  I'm sure there are a few more that would be interesting.

Wow.... I like this idea.  Imagine that, some hard data to help make a presidential decision on.