Democrats still hate him claiming that he cost Al Gore the 2000 election. Republican's basically ignore him, like that crazy uncle at the dinner party, and the Greens for some reason seem to believe he can win and change the world.
The truth is, Nader will bring up some valid points over the next 9 months, but basically be ignored by the media, and go away again until 2012. Considering the drop off in votes he received in 2004 (.38%) compared to 2000 (2.7%), it's doubtful that he's going to be a spoiler this time around, hell, he may not get any votes at the rate he dropped.
So, good luck Ralph, hope you find a way to get your message, out, and we'll see you again in 2012.