Many people in America do not trust this "warmth and welcoming" that is characteristic of Obama. They believe there is some evil motive behind everything he does.
"If you go looking for the bad in a man and expect to find it, you surely will."
There are some GOP congresspeople who are going to boycott the Pope's speech to both houses of government. That tells me a lot, too.
Like the Irish and the blacks, Catholics are hated and feared by many as well.