Because the minute they do, 75% of the people who have never heard about this will say “Birth Certificate? What the heck are they talking about?” and that would be the beginning of the end. For his credibility if nothing else.
A woman at work told me today she was talking to someone in Philadelphia who told her this story was “all over the place” about his birth certificate. She knew nothing about this and thought this would now be on the news tonight. I had a good laugh about that.