SkaterDave, simple answer to your question: No one.
It's not even about sanctioning body, although I've made my opinion on what entity I think that should be abundantly clear. It's about a series that offers an event in every region of the country. You know, like when Springsteen is on a "national" tour, he doesn't stop at Traverse City, Michigan.
Now you could say, and you would be correct, that the East Coast remains the hotbed for offshore racing, and you wouldn't be wrong. But there are some very legit racers including Mike Defrees, Bob Teague and Paul Whittier who have raced and succeeded at the national level.
My point is that a series with events in each region—Northeast, Southeast, South, Midwest, Southwest, West (I'm sure I missed one)—can legitimately call itself national. At this point, that series does not exist in offshore racing.
It's not about the number of races. Ten races in Florida, for example, isn't national. It's about offering one major event per region, which is what I understand the people at Powerboat P1 North America would like to do using existing organizations under the APBA sanction. The rules for the P1 classes are already set so that APBA would simply add them, as would organizations like OPA and OSS if they were APBA sanctioned.
If there were just three P1 races in North America in 2011—one in New Jersey, one in Florida and one in California—only a fool would call that a national circuit because major regions would be left out. Trust me, I'm with you on that.
If you get a chance, reread what I wrote on
http://speedonthewater.com. It's pretty clear. Will it succeed? I hope so. But if it does that success will do nothing to compromise the success of existing organizations in the states.