Donald Trump has gained on Hillary Clinton in recent national polls after becoming the presumptive GOP nominee this month. But Trump may also be helped by the ongoing primary battle between Hillary Clinton and Bernie Sanders. Although Clinton’s substantial lead in pledged delegates (and larger lead in overall delegates) makes her the all-but-certain Democratic nominee, her lack of support from Sanders voters is harming her general election numbers. CONT.
Nate Silver, FiveThirtyEight