This poll has Kerry ahead by six two ways: both with Nader in and with Nader out. Which implies that Nader-in draws from both sides equally.
Now all along I've thought that Nader's argument that he would draw from Bush's support as much as from Kerry's has struck me as errant nonsense. No one on the right is going to choose Nader. They might send him money, in order to bolster his position as a spoiler against Kerry, but they wouldn't actually vote for the barstid, was my reasoning.
But here's a thought I hadn't had before: what about all those disaffected R's who do want to vote, but don't like Bush? Is it possible they would lean more towards going to the polls and pulling the lever for Nader, as a protest, rather than staying home? I'd just as soon they stayed home. But it looks to me like there's starting to be at least a little data supporting the idea that, abhoring the idea of voting for a Dem, they might enter a FU vote for Nader.
Not sure that adds up to an argument for Nader to be in the race, though. Just a thought. Flame away...