Remember back to the tracking polls in the North Carolina primary? They said it was going to be close. Obama won soundly. The problem with polls as has been brought up by many people including the very astute Chuck Todd on MSNBC is that many of the new voters do not have land lines. They have cells as their primary phone line. Most polls are made to land lines. Since the younger voters which make up a large segment of Obama supporters are not polled, it is hard to tell if the numbers are accurate. Obama's lead could actually be larger than it is because of this phenomena which started to emerge in the '04 campaign, but is even larger today.