This is interesting, but it does conflict with what I had read here on FR that Gen X / Gen Reagan women were solidly in the Bush camp throughout the runup to the election. I don't have time to look up the article right now though.
It was this post
http://www.freerepublic.com/focus/f-news/1260568/posts
Bush was up by 8 in the 30-39 group, This was the Rasmussen poll
Here is what he has on his site
Generation Y (18-24 yr.olds): Kerry 59% Bush 40%
Generation X (25-39 yr olds): Kerry 50% Bush 48%
Generation Jones (40-49 yr.olds): Kerry 48% Bush 51%
Baby Boomers (50-59 yr. olds): Kerry 52% Bush 47%
Mature Generation (60 and older): Kerry 51% Bush 49%
I think he is fudging the numbers, He is using a poll from the NEP which didn't use those age brackets
Quote "These special age cross-tabulations of the NEP Polling highlight the importance of looking separately at actual generations of voters. The standard NEP Polling Report uses the arbitrary age categories of 18-29, 30-44, 45-59, and 60+, splitting Generation Jones in half. By lumping half of these conservative Jonesers in with the liberal Xers, and the other half with the also liberal Boomers, an important story of the 2004 election was hidden.
Cross-tabulations of polling from Rasmussen, Gallup, Zogby, Pew, ICR, and AP-IPSOS, released two weeks before the election, showed that Generation Jones women were the only generation of women who had consistently vacillated between Bush and Kerry in the six months before the election".
So basically picking and choosing polls BEFORE the election and pushing more liberals into Gen-X & the "True" Baby Boomers to get a result that Gen Jones matters most. (It must of pained him because reading his site he seems to lean liberal)