And for all that "military experience", he still thought invading Iraq was a great idea, he still thought it would be a cakewalk, he still thought it would be over in a couple of weeks.
So why would we want all that "experience" if it just leads him to make poor decisions?
Obama didn't have that kind of "experience" and yet he opposed the invasion of Iraq, Clarke's point is that we need a president with good judgment , and based on the record, Obama has shown better judgment than McCain.

The GOP is trying to sell us a '72 Pinto with 300,000 miles on it, based on the argument that it has "more experience" than a new car.

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“ The subjects of every state ought to contribute towards the support of the government, as nearly as possible, in proportion to their respective abilities; that is, in proportion to the revenue which they respectively enjoy under the protection of the state.”

Adam Smith , The Wealth of Nations 1776

"We have always known that heedless self-interest was bad morals; we know now that it is bad economics"
FDR's second Inaugural Address