A "Cycle for Safety" baton.
You hand it off to another rider. That rider has their local news outlet covering as well, with the message of share the road. No stopping it, Maine to California could be a first run, but maybe every state then back to the start. No route, just get it to the next rider on time. People sign up on a website, maybe have alternative riders to ride along and "cover" in case somebody doesn't show or drops out.
Probably needs a few laps around NYC and other big metro area's where running down cyclists seems sporting.