If he falls bellow 3% he won’t qualify to the next debate.
FWIW, they don't use just one poll. They take an average of polls over an interval of time. Another point is look what happened when Fiorina wasn't eliblbe for the varsity stage for that second debate. No problem....the puppetmasters changed the rules.
We can be confident that the puppetmasters would change the rules for Jeb. It's become really insulting that we "little folk" don't agree with Jeb and don't even like Jeb, yet they're still trying to find a scheme to get him nominated.