Watching the progress of Donald Trump in the Unites States presidential primaries has been compared with watching a train wreck. It is appalling and compelling. Trump is breaking so many of the rules of ordinary human decency - let alone politics - it is impossible to look away.
This week he declined to denounce the Ku Klux Klan and blamed the troubles of Trump University on a "Hispanic" judge. Each week brings an outrageous claim, a shameless boast or an offensive remark that looks more careless than calculated.
Doubtless the fact he is compulsive viewing is a large part of the reason he has come this far in the primaries. He knows how to retain a television audience, having hosted a long-running reality show, and he is campaigning in much the same way.
Many Americans are enjoying his free-wheeling approach, being himself, steering by the seat of his pants.
He does not claim to have much policy, or much interest in making it. He plans to hire people for that sort of thing if he gets to the White House. The very idea of that has filled many other Americans - and most of the world - with horror. But it is an idea that has to be faced now Mr Trump has cleared the highest hurdle in the long race to a party nomination: yesterday's primaries.