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The problem with having debates between presidential candidates is that everyone wants to get involved -- not only 3rd party candidates who arguably should be included (something I'll leave for others to argue about), but conceivably every wingnut & blowhard out there who is willing to declare her or his candidacy in order to talk about his or her pet peeve. At the time, the networks were bound by the rule that they had to provide equal access to every point of view -- so allowing the Democrats & Republicans to present their views meant that anyone on the ballot for president could sue to be included in the debate.
(Don't laugh, it has happened: a street preacher here in Oregon would run for various offices or support various measures for the obvious reason of getting his Bible-quoting rants into the state Voter's Pamphlet & front of a large audience. His argument in favor of legalizing Marijuana (consisting of one short paragraph in favor, & several long, rambling paragraphs quoting Scripture about something I never bothered to finish reading about) was reprinted in harper's Magazine.)
To deal with this problem, the networks, the 2 major parties, & the League of Women Voters (who sponsored the original debates) came up with the idea that the LVW would sponsor a number of debates between candidates they invited -- which, being news, the networks would then broadcast without worrying about providing equal access to anyone else.
I believe this is why an audience is still included, even today. And anyone with the money or the backing to sue to get included (e.g. Perot back in 1992), is simply placated by being included.
Geoff
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