The network reported that its tracking poll showed him with a 20-point lead, one point greater than before the Republican convention.
Until about three weeks ago, polls showed the federalists with a comfortable lead.
All of them showed the social democrats with a slight lead.
Most polls in the final days before the election showed Bradley with a significant lead.
Polling data showed him with an early lead in the race, and he remained the favorite throughout the campaign.
Polls have repeatedly shown him with a small but statistically significant lead over the other three Democrats.
Mr. King said his own poll showed him with a 23-point lead.
Internal polls showed him with a solid lead and plenty of support from Democrats.
The final 3 poll average showed Kerry with a strong lead of 57% to 31%.
Early polling during the general campaign showed Obama with a very narrow lead.