Disgraced New York mayor hopeful Anthony Weiner has fallen to fourth place in the city's Democratic race.

But the former congressman was still the centre of attention in a heated televised debate.

In his opening statement he was contrite, saying: "I said from the beginning of this campaign that there were things in my personal background that I was embarrassed by.

"Things I worked out with my wife in the privacy of our own home, but were unfortunately being played out in front of the whole country.