In the first poll since John Kerry locked up the Democratic presidential nomination, Kerry and US President George W. Bush are tied while independent Ralph Nader has captured enough support to affect the outcome of November elections, validating Democrats' fears.
The Republican incumbent had the backing of 46 percent, Kerry 45 percent and Nader, the 2000 Green Party candidate who entered the race last month, was at 6 percent in the survey conducted for The Associated Press by Ipsos-Public Affairs.
Bush and the four-term Massachusetts senator, who emerged as the Democratic Party's nominee Tuesday after a string of primary race wins over several rivals, have been running close or Kerry has been ahead in most recent polls that did not include Nader.
Since Nader entered the race Feb. 22, campaign strategists and political analysts have been trying to assess the impact of another presidential bid by the consumer activist whom Democrats blame for Al Gore's loss in 2000.
Four years ago, Nader appeared on the ballot in 43 states and Washington, DC, garnering only 2.7 percent of the vote. But in Florida and New Hampshire, Bush won such narrow victories that had Gore received the bulk of Nader's votes in those states, he would have won the general election.
Exit polls from 2000 show that about half of Nader's voters would have backed Gore in a two-way race. Nader dismisses the spoiler label.



