In a wrong way Andrew Johnson. His views were formed early in his youth and he was unwilling to evolve in face of changing times or ever consider opposite viewpoints. Surely there were good sides of his personality, like unconditional sticking with the Union no matter what, but he lacked political flexibility to get things done as President.
If the only things you can get done are things you don't want done, then flexibility is overrated. Personally, I think Zachary Taylor is a good choice for most stubborn President. It would have been interesting to see what would have happened to the Mexican Cession if he had lived.
