Nine months from now, Republican candidates for president will meet on the stage of the Reagan Presidential Library (with the old Air Force One providing great visuals) for the first debate of the 2016 race. It seems likely that among those in attendance will be at least four -- Chris Christie, Bobby Jindal, Mike Huckabee and Jeb Bush -- who support (or once supported) the Common Core. Republicans are about to find out what's been percolating among the grass roots. Properly undertaken, a debate about Common Core could be healthy for the party and the country. Or it could be an unholy squabble over rumors and bogeymen. We'll see.