My guess is that you're talking about the CBS/NYT swing state poll? For that to be true there would have to be a record Democrat turnout. Biggest in modern political history.
Florida:
In 2004 the vote was R+4.
In 2008 the vote was D+3
CBS/NYTs is reporting that in 2012 we will see D+9.
Ohio:
In 2004 the vote was R+5
In 2008 the vote was D+8
CBS/NYTs is reporting that in 2012 we will see D+9
Pennsylvania:
In 2010 the vote was D+3
In 2008 the vote was D+7
CBS/NYTs is reporting that in 2012 we will see D+9
I want no tears from you the morning of the seventh.