In the kind of pivot that often marks his approach, he goes from asking why some star college quarterbacks are successful in the NFL and others flame out to the question of why some people make great teachers and others fail miserably.

CNN: The man who can explain everything

Some came to make a fortune, others to write the great American novel.

ECONOMIST: New fiction

The world's richest nation, one that presumes to great moral authority, cannot simply make worthy appeals to conscience and call on others to carry the burden.

ECONOMIST: Peace-making in Bosnia

And in this proposal and others, he has made clear in great specificity the kinds of tough choices he's willing to make.

WHITEHOUSE: Press Briefing