A couple of comments:
1) I can’t take a “national” poll seriously that samples 829 people total, no matter what the internal breakdown.
2) I know a lot of people who support Trump who answer with “Gary Johnson” when asked by poll takers who they will vote for.
You can’t trust polls now a days, because they are used to move public perception, not gauge public sentiment. Trump has way more support than TPTB wish to acknowledge. The big question is does he have enough to cover the spread once the massive Dem voter fraud that takes place every election cycle is added to the mix?
The sample is too small and the smaller the size, the larger the sampling error.
And you can’t determine what voters they reached and determine how they arrived at their responses.