I don't follow your logic here. Stubborness is not a virtue. Being pricipled is.
To add to your list:
Hitler was stubborn.
Stalin was stubborn.
Not suggesting our president is anything like them. Just pointing out that being pricipled is not the same as being just plain mule headed! And I think Bush sometimes falls into that category.
I didn't say that stubbornness is a virtue or that it is a vice.
and....
(From Merriam-Webster) principle - (2) a rule or code of conduct
Being "principled" can be either good or bad, depending on your rule or code of conduct.