A president needs inspiring rhetoric, savvy, and a like-minded public.
Petraeus and Crocker shared the stage with presidential hopefuls, who all had much at stake.
Bush sends the free-trade agreement to Congress, but stiff opposition could derail it.
For some years, China's boom and the war on terror have overridden human rights concerns.
Few will begrudge the couple its wealth, experts say, unless business ties raise red flags.