I just hope he reads the thing. There are a few topics, which I won't go into, that don't really rise to the level of national importance, in my opinion. You'll see.
Vote on your ideas. Make it a worthwhile venture, not just one controlled by folks who are internet savvy. Find the ideas you like less and vote them down to give more power to those you like (which you will vote up).
My favorite is about Lung Cancer, Making It History. I say my favorite, because in four or five paragraphs I learned a lot that I never knew about the disease. Check it out. It's a sad story.