The Gore model is a good one. A documentary is the ideal format. Serious subject matter says "I care," and the long-form type lends gravitas. This does not mean, however, that the potential candidate should necessarily choose Issue Du Jour. After all, Mr. Gore spent years being ignored in Congress, when he'd go on and on about environmental stuff while everyone else headed out for drinks, long before Leonardo DiCaprio ever considered driving a hybrid. And now we care because Al cares (and because "Kyoto" is a fun word to say).
Accordingly, I propose a theme that is already near to Karl's heart, one which will probably become relevant somehow in the next twenty-five years: prairie dogs. Sure, the hum of this issue is still pretty low; no one has sent Anderson Cooper out to the midwest yet to do an in-depth story with his characteristic "empathetic face" on.
But if we begin to get the word out now, the Academy will be ready for a revelatory film by 2030. And it will be a great night. Dakota Fanning and Karl doing scripted banter about his coy non-answers about exploratory committees. Ryan Seacrest (after his fourth facelift) asking inappropriate questions on the red carpet. And--ultimately--a swell of Hollywood goodwill and contribution dollars before the hangovers set in the next morning.
The gaudy, glitter-strewn stage has been set. I think we're up to this challenge.