… So far this year, live-interview telephone surveys have tended to show Mrs. Clinton leading by a slightly larger margin than those conducted online. There hasn’t been a live-interview telephone survey since Mr. Trump beat back all his rivals early this month. So Mrs. Clinton’s seeming lead has seemed to shrink particularly fast.
Why does Mr. Trump do better in online polls? And are the online polls right? CONT.
Nate Cohn, New York Times