Several new polls show President Obama with a wide lead in many swing-states. Some say there is a bias.

Of course, the polls could be wrong. But it seems unlikely that the people who do the polls would show a deliberate bias as this would tend to destroy any credibility in the long-run.

But there could be all sorts of unintentional bias. Younger voters tend to have cell phone rather than landlines and so might not get the call. I have a landline but tend to look at my caller-ID and not pick up calls from numbers I don’t recognize and that don’t attempt to leave a message. Some who indicate they are probable voters might not actually vote.

There are probably quite a few other reasons. But the one that came to mind is voter suppression as a consequence of the Voter ID laws mainly sponsored by Republican legislatures. This seems to be a factor here in Pennsylvania.