Hello, Irene.

Ralph Nader is running again, but he's getting hardly any media attention because he has very little support. Therefore the number of people who will vote for him will not make any difference in who will be elected as USA president. Consequently [rightly or wrongly], Nader, and Bob Barr and other third party candidates were not invited to participate in the national debates.

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Btw, I've just noticed that people in the UK use the phrase "standing for election" while people in the USA say "running for election". That's interesting. I'm not sure why there is that difference and what, if anything, it means.