But Pollster allows you to make your own aggregate polling graphs using different data filters. If you filter out the internet polls and automated robo-phone call polls, the results change significantly, and which party is leading depends on how much smoothing you use to to draw the trend line tracking the polling data points:
47.2% Obama vs. 44% Romney (less smoothing)
46.5% Romney vs. 46.1% Obama (moderate smoothing)
47.1% Obama vs. 46.1% Romney (more smoothing)
If there is a fundamental flaw in the automated-phone-call methodology, then the race in NC may be shaping up differently than how it is being widely reported.