1300? Trump has about 20 times more people than that at his rallies.
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Did you think they could poll the entire country?
1300 in the poll figures to be like 13 million real people.
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The Trump deniers don’t get that fact.
Trump shares one problem with Jeb Bush and Hillary Clinton. No undecideds.
Either you love Trump or you hate him. There are very few undecideds in the squishy middle that he can pull over to his campaign. There are no voters that have not heard of him or already formed an opinion about him.
When a candidate is unknown (like Obama in 2008), it is much easier to convince the squishy middle undecideds to swing your way. People have a tendency to assume that the unknown candidate is much better than he is. That is why in most polls pitting an unnamed opponent against an incumbent, the unnamed opponent usually comes out on top.
Many if not most of the undecided squishy middle voters are too stupid to be allowed to vote. Unfortunately, they are allowed to vote (and frequently delivered to the polls by Democrat activists) and there are enough of them that they usually determine elections.