The familial lineage of a candidate was never as obscured before.
Nobody questioned the citizenship of the parents of candidates because there was no doubt about it before (excepting Arthur, partly because he was obtuse about it, and partly because he ran for VP, and therefore received less scrutiny).
-PJ
http://www.scribd.com/doc/29744612/Breckinridge-Long-A-Natural-Born-Citizen-Within