Ping the President

I've registered pingthepresident.com for this, until it becomes pingthepresident.gov.

Design considerations:

Subscribers should be listed in random order, so there's no glory in being the first to submit the idea
Added comments must pass muster with all subscribers. If not, they are rejected, and the commenter is allowed to withdraw their assent, or submit revised comments.
Changes to the wording of the original proposal can be suggested, and adopted if all subscribers agree
24-hour or user-set turnaround time for any changes
Differentiates between time-sensitive pings and long-term, recurring pings
No direct route - perhaps even no display - of the top-rated, most-subscribed pings - that overly favors the first ones submitted. Instead, the only way to join a ping is to enter it for yourself first, then be prompted through a search to join the most similar one, if one exists that's similar enough
Close the pings and deliver them through an API to the President on a regular basis - once a day, once a week, whatever either the pinger sets, or the President wants to allow. Perhaps deliver to the President's assistant on a pinger-set interval - and to the President on a President-set, publicly-disclosed interval
The President/assistant commits to reply to a certain number - perhaps the top 10, plus a truly random selection of another 10 - since everyone deserves some chance to be heard, don't they? Even if they're a party of one.