As long as there is free stuff and free money in it for them, 50% of Americans could care less if Obama was from Brazil.
Yes, and there appears to be a significant number of people whose biggest motivation is to have people in power who will stick it to the people they resent. Not only would these voters not care about the citizenship and eligibility of the President, they would actively assist in hiding the truth from the American public if they could. Their motivations are personal, and born of resentment, not patriotism. The bottom line is that a fair number of Americans dislike America.