I have no idea if either one of them were, but the screening, if it happened, would have happened in a different location from the actual event, and at least a few minutes earlier. Which makes it possible that it did happen but the second guy never knew it. Or that there were multiple units involved and one of the unit leaders took it upon himself to screen for Obama voters (which makes it no less egregious but puts it on that leader rather than Obama), and another did not.