Clinton has learned that trying to explain herself to irrational people is futile and is instead concentrating on winning the election.  How do you reason with a birther mindset?  You can't.   This isn't the Democrat's problem right now, it's the Republican's.  They created this mess.  Hopefully Trump will go the way of Palin and be nothing but a laughing stock two years from now, even among his current supporters.  That's the thing about dumb, irrational candidates who lack a shred of integrity - people run from them when they lose.