@parados,
Parados, your excerpts include three specifications of what one should take or keep, none of which defines "need" in a way that provides anyone other than each individual a way to decide for him or herself what he or she needs at any particular time. The individual is given only these guidelines: Take or keep only that which is,
(1) less than or equal to whatever one thinks one can
make use of.
(2) less than or equal to that whichever one thinks is
not too much
(3) less than or equal to
whatever one thinks one needs.
In other words, Obama and McCain should protect each individual's right to decide to take or keep no more than the individual thinks he or she thinks is not more than he or she can use, not too much, and not more than one needs
.