Many Romney supporters are simply not interested in talking to pollsters.
As I previously coined it, The Obama Effect.
You actually know that silent majorities don't exist, don't you?
What reasons could have Romney supporters to lie in a massive way?
Anyone looking for evidence of a silent majority should look at Alberta 2012 elections. Wildrose frequently polled in majority territory and looked to be sailing to an easy victory on election day. On the flip of a dime or perhaps because of the very real inconsistencies and shortfalls of polling (whether it was an issue with PC supporters less likely to answer phones or more likely to answer untruthfully can be debated elsewhere), they didn't even come close to winning. Lesson learned: polls are junk and it's only the final votes that ever matter.
I've got some guys I know in Calgary, not crazy right-wing cowboys but just professional businessmen, and I can confirm this sounds about right from what I've heard.
Polling is becoming increasingly difficult in this hyper-partisan environment that is becoming dominated by cell phones and Internet phones.
Liberals are louder than ever before right now, or at least since the '70s, and that goes for all of the United States, and Canada too from what I can tell. Bottomline: Relative to liberals, moderates and conservatives know better than to speak up too much. I mean, they have better things to do than get into a [Inks] measuring contest with shrill liberals. Of course, that does not mean they will not speak up on Election Day.