The introduction of long-time activist Ralph Nader into the mix is having an effect on the race, as he wins enough support to make a difference, the poll shows. . . In the McCain-Clinton-Nader match-up, McCain leads mainly because of a significant advantage among independents. Among those voters, he wins support from 45%, compared to 28% for Clinton and 15% for Nader. McCain wins 79% support from Republicans, while Clinton wins 75% support from Democrats. […]
In the McCain-Obama-Nader match-up, the independent candidate is having the same effect. Nader wins 15% support among political independents nationwide. Ideologically, Nader wins 18% support among progressives, and 12% among libertarians. He does less well among mainline conservatives and liberals compared to the match-up including Clinton.