The McCain-Obama matchup this fall is interesting, for the contrasts, but I have to agree that Obama has the once-in-a-generation kind of charisma.
I would say that, in 2007/2008, Obama is far more charismatic. Bill Clinton has tried to inject his "charisma" into this campaign on his wife's behalf and has not made a dent in the "charsima gap" between his wife and Obama.
Trying to compare charisma of 1992 Bill to 2008 Barack is like trying to athletes across eras. Different issues, different prevailing attitudes among the populace, etc.
Mr. McCain abandoned his wife, who had reared their three children while he was in Vietnamese prisons, and he then began his political career with the resources of his new wife's family.
Yet although Mr. McCain's children and some friends were angry and disappointed with him at the time, they rally around him today. No candidate could be luckier in his choice of an ex-wife than Senator McCain, and he must be the only politician around who could cheat on his wife and divorce her and still get her support and her campaign contributions today. Even her friends rave about him.
http://query.nytimes.com/gst/fullpage.html?res=9B02EFDF1439F...I also worded the original comment too strongly. Clearly, charisma is a big factor in modern elections, and one data point isn't enough to disprove anything in any case. Concluding that "it's charisma, stupid" does seem to rely on very small-number statistics, though.