Thus far in the campaign, Trump has worked to enthuse his past supporters rather than try to extend his reach beyond already-loyal elements of the electorate. But the poll shows he is faring worse now than in 2016 election polls among non-college white voters as well as political independents, both groups that helped power his victory. In 2016, he won non-college whites by a 36-point margin, according to a Pew Research Center analysis, but he leads Biden by half that — 18 points — among registered voters in this group in the latest Post-ABC poll.