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I don't know precisely; if somebody is or was a major office holder - Congress, Senate, Vice President, Governor - they are pretty much guaranteed inclusion in the debates.
Minor office holders are usually not, unless they are major national figures. Irvine, California mayor Larry Agran was not allowed into the 1992 debates seeing as how the political office he held was not a major one; however, I would suspect that if a NYC, Chicago, or Los Angeles mayor were to run they would be included.
Those who have never held public office seem to be included only if they demonstrate a major level of national support; e.g. Jesse Jackson, Al Sharpton, Wesley Clark. This would exclude LaRouche, whose group is correctly regarded as a tiny fringe political cult. Although it should be noted that LaRouche *was* allowed into at least one of the New Hampshire debates in 1980, probably on the grounds that he had been polling in the double digits there. (He wound up with 2% of the New Hampshire primary vote in 1980 - his support dropped off rapidly after the word got out about his esoteric views.)
There's also a "payback factor" involved, as seen in 1992 when Eugene McCarthy was excluded from the debates. He had been a Democratic senator and 1968 presidential candidate, but made a third party run in 1976, and threw his support behind the Libertarian candidate Ed Clark in 1980. I suspect that if either Ralph Nader or Ross Perot were to announce that they were entering the Democratic primary in 2008 they would get the same cold shoulder that McCarthy got in 1992, for the same reason. This also applies to LaRouche, who always runs as an independent in the general election after first running in the Democratic primaries.
On the other hand, George Wallace was allowed in the 1972 Democratic debates after running as an independent in 1968, so there might be exceptions to that last rule, again, based on what level of national support the candidate can demonstrate.
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