Gender Gap

Earlier this week, there was talk of the gender gap being close to "historic highs".
A blog on nytimes.com even displayed a graph showing this gender gap:

A you can see, there is a clear 18 point gap, just below the record holding 20 points.
But only a few days later, new articles came out saying that Obama and Romney have already closed this gender gap.
Why the sudden change in only four days? Most men coming from Romney's side to Obama's are unmarried and sure why this makes sense, but it does. Obama's strong stance with women has changed, maybe because these women are like Monica Jensen who shifted her vote to Romney this time, largely because of the economy.
The Christian Science Monitor discusses this, saying that "Polling experts note that each poll has its own methodology, and so the two can’t be compared. Each polling outfit has its own criteria for identifying “likely voters,” and weights segments of the population differently."
I guess the only thing they can do now is celebrate their victories.