To run or not to run?

In an open letter to Ralph Nader, editors of The Nation urge the former Green Party candidate not to seek the Presidency as an independent candidate (Nader having already withdrawn his name from consideration as a Green Party candidate).

Nader responds, and in doing so, demonstrates the divisive effects his potential campaign would have on the left. Though I voted for him four years ago, and agree with most of his arguments about the problems of our current electoral system, in my mind, all he can do is hamper efforts to remove the President from office.