How Can NASA's Road To Mars Be Made More Affordable?

MarkWhittington writes: The Houston Chronicle's Eric Berger published a piece that touched on one of the most vexing issues surrounding NASA's "road to Mars," that being that of cost. How does one design a deep space exploration program that "the nation can afford," to coin a phrase uttered by the old NASA hand interviewed for the article? The phrase is somewhat misleading since one of the truisms of federal budgeting is that the nation can afford quite a bit. A more accurate phrase might be, "that the nation is willing to spend."