Anybody who thinks "Birther" is a racist term, the only reason the MSM would use it, would never vote for Trump anyway, so you are correct, non-issue.
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And if they try to link it to racism during the debates, Trump should fire back with some historical facts the prove Barry wasn't the 1st to be questioned (nor the 2nd or 3rd):
Chester Arthur, the 21st president had his birthplace and eligibility questioned (back in the day...and still today). The same guy who had many of his personal papers burned (a pdf file) a day before he died (more than a curiosity).
Did anyone cry racism when they wanted to see McCain's original B.C.?
Did anyone cry racism when they wanted to see Eisenhower's?
And as it turns out Arthur had his papers burned only because his Dad was not a citizen when Chester was born...making the case that Chester knew he was not an NBC as commonly known at that time.