Romney is eroding Obama’s voter demographics, and he is expanding the playing field into previously safe Obama states, (WI, PA) turning them into near toss-ups, and forcing Obama to decicate resourses/money where he didn’t expect to.
And he is polling consistantly at 50%, while Obama hovers around 46-48%.
Don’t get me wrong, I do believe Romney’s winning and that things are just as you describe.
I just don’t buy a poll that says a significant number of men are moving from Romney to Obama. There’s nothing going on in the race that would explain that. Remember that Pew admitted that only about 9% of the people they call answer the survey. That means you can have some really weird results in certain demographics, and Dems are almost always oversampled.