Obama on the Muslim emails:
We have no way of tracing where these e-mails come from, but what I know is they come in waves, and they somehow appear magically wherever the next primary or caucus is, although they're also being distributed all across the country. But the volume increases as we get closer to particular elections.
That indicates to me that this is something that is being used to try to raise doubts or suspicions about my candidacy.
Best not to get paranoid.