Hillary Clinton's favorable rating among 18- to 29-year-olds is well below her favorable rating among those who are older, which is a highly unusual situation for a Democratic political figure.
Americans' view of Donald Trump is now identical to their view of Hillary Clinton, at 37% favorable and 58% unfavorable. Previously, Clinton has always had the more positive image.
In his recent article in the Journal of the American Medical Association, President Obama relied on data from the Gallup-Healthways Well-Being Index to assess changes and identify patterns in states' uninsured rates.
Melania Trump's pre-convention favorable rating is the worst of any potential first lady Gallup has measured since 1992, mainly because Democrats tilt strongly against her. Republicans are more positive, though many can't rate her.
In the U.S., one in four view Trump and Clinton unfavorably, much higher than the percentage who disliked both candidates in 2012 or 2008. But this doesn't mean turnout will be low or a third-party candidate will be successful.