Some years back a man I know says he was leading a crew of bricklayers and laborers building a brick wall several storeys high. They were up a few decks high on the scaffolding when suddenly they felt it give way. Somehow no one was hurt, but you can bet that this was investigated.
Looking through the mess it was discovered that the lowest levels of the scaffolding had had its braces removed. So the laborer who had been responsible for this was questioned, and he told them that the braces were in his way and they weren't working on those levels anymore anyway, so he took them out. Whoops.
So our hero fired that laborer, right? No. As he put it, "Now he knows he needs to keep the braces on all of the levels. I can't afford to teach another one."
And so it is with Presidents. Those suckers are expensive to train. Whatever you might thing GWB and his team have fouled up, he does have that expensive experience. John Kerry and John Edwards certainly do not (and judging by their attendance records they don't have so much Senate experience either).