I think a lot of advertisers and television executives have a lot invested in making the race close and manipulating the public opinion into thinking things are a nailbiter.
Ratings control truth.
I think what Romney said in his embarrassing little speech to his donors last spring is true, and it's true to both sides, (not the "everyone is a moocher" part... but the percentage of people who aren't changing their minds.)
I think it's mostly a contest of which side can coax the most of their backers to get up and go vote.
the republicans are pretty good at that.