Nader says that he gets just as many votes from Republicans as from Democrats.

Nader is full of crap. Exit polls showed pretty close to zero republicans voting for him. Further, as a third-party candidate, he is no more satisfying than the candidates from the two big parties.

In any case, my statement was meant as a joke (though I probably didn't make it obvious enough, which is my fault). As I said before, looking at the poll data, Nader and all other third-party candidates combined did not play a significant role, even in swing states.