@Vincenzo -- I am not going to get involved in a debate about whether Jimmy Carter was a failure or not. I don't want to defend the man or accuse him, either.
I would like to point out, however, that Carter has been one of the best former president's we have had. Charitable endeavors such as Habitat for Humanity (a Carter initiative, of course) have benefited this country greatly.
Love or hate Carter's time as president, it is hard not to respect how he has used his name and image to achieve some real good in the world. That should come as no surprise, considering how Carter considers himself to be a strong Christian and serving others is an important part of his faith.