I don’t think I voted in the poll linked to in the OP, but I thought Hilary would win - not necessarily in a landslide, but pretty easily. I didn’t want her to win, but I thought she would.
I didn’t want Trump to win either, so I voted for the Libertarian candidate - not because I thought he had any chance, but if the Libertarian party in my state got 5% of the vote they would get major party status and would appear automatically on future ballots and they wouldn’t have to do the signature and petition thing anymore.
That didn’t work either.
Trump won.
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The advantage in a Presidential election is to the incumbent. That isn’t always a lock, as witnessed by Carter, Bush 41, and Ford, but a race between an incumbent and a challenger has a different dynamic than one between two non-incumbents, and the incumbent usually has the edge.
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The economy is doing quite well. That gives a large advantage to an incumbent President, whether he or she is actually responsible for the economy, or not. (Usually not.) Obviously that could change in the next year and a half, and maybe even it can be plausibly blamed on his dumb trade policies. But unless it does change, the advantage is still Trump.
The times when the incumbent lost usually have some over-riding factor to offset incumbent advantage.
Ford pardoned Nixon, the economy sucked, and Ford said stupid stuff about Poland, and it was still close.
Carter lost because the economy sucked, and because he said stupid stuff about malaise and Reagan offered hope and confidence. It wasn’t particularly close, though.
Bush 41 lost because the economy sucked, and because Reagan’s coat tails wore off after four years. And because Bill Clinton was the best pure politician of his generation. He (Clinton) was really, really good at politics. Bush 41 was a stellar resume and not much charisma. Also, Ross Perot. It wasn’t close, very much - Clinton got less than half the vote, Bush got way less than half the vote, and then Clinton was re-elected (also with less than half the vote) because the economy was doing well.
A lot depends (of course) on who gets the Democratic nod. Sanders? Trump, easily. Warren, Booker, Harris? Trump, easily. Buttigieg? Trump. Biden? Closer, but still advantage Trump. Biden suffers from some of Hilary’s drawbacks - he’s not black, so he won’t get the black turnout that Obama got, he is a gaffe machine and it will take some spin to get around that. Mostly, he is like Hilary and Bob Dole and John Kerry and even Bush Sr. - not necessarily popular or beloved on his or her own - it’s just their turn.
As mentioned, polls mean virtually nothing at this stage. And my track record as a prognosticator is on a par with the Psychic Hot Line.
Regards,
Shodan