The huge nature of these swings, as in the Georgia Senate race -- "Cleland now leads among Independents (58% - 39%) when just days ago, Chambliss led (62% - 33%)." -- make it appear that Zogby's sample is very unstable.
Or, perhaps, that the electorate has itself become very unstable as we approach the finish. All of these are very fluid races, it seems to me.
Yep independents and undecideds can make big swings when they finally come onboard with a decision. It just depends upon what the issue(s) is that hits their hot button... These are the ones that all the candidates have been playing for during the past few weeks..... imo