Mr Giuliani's reputation as tough on terrorists rests largely on his unflappability after the World Trade Centre was attacked.

ECONOMIST: The election: Who will take on Hillary? | The

In the country, his genial unflappability and natural authority were reassuring, as was his apparent ability to keep the unions quiet.

ECONOMIST: Obituary

That unflappability served him well during the lunar landing.

ECONOMIST: Neil Armstrong