Actually, nobody who craved the Presidency has ever won it. President Bush was never worried about losing it, but felt that he had a duty to his Country. Craving it is one of the things that has hurt Dems over the years.
Fred Thompson is doing it his way which to some is very appealing and to others not. Same with the rest of the candidates. All cept 1 are very electable.
Pray for W and Our Troops
Bill Clinton.
He has the strength of character not to destroy him if he lost and it was not the be all for him but he showed that he had strong desire to achieve and want it for exactly the reasons you state duty to his country.
Having passion and desire and wanting the Presidency does not mean for your own self importance but for the good of the country.