In fact we all know that that is what the potential candidates have to do. They must appeal to the more lunatic fringes of the party when they are campaigning to be the candidate. But the minute that they have to face the electorate in the Presidential election, all the nuttiest stuff has to be dumped.
It's just that this is the first time that a senior aide of any potential has actually come out and admitted that they intend starting again from zero if and when they are on the real campaign trail. As you can see from this video, the Democrats are having fun with it.
Incidentally, as Danny never tires of reminding me, the presidential starts in the snows of New England in January (although this year it started in Iowa on January 3), and it ends in November, with the actual election.
Who the hell would put themselves through that, and having done it, will they be in any fit shape to take over running the Western world?