Except when it actually is part of a Bush dirty tricks campaign, this kind of squabble is just silly.

The sensible thing to do is organise voter trading, maximising the anti-Bush vote where it is effective, and in the process maximising the Nader and Green vote in other places.

Here's the "VotePair" site. (Though, for Mudcatters over in the States who are inclined to try this, I'd have thought doing it via PMs with Mudcatters you trust to keep their word might make more sense, since trust is the essential feature in this kind of arrangement.