Goldwater won the GOP nomination. Dukakis also beat “all the other (primary) candidates”. Same for Mondale. What’s your point?
Currently, Hillary is polling for a very easy win against Trump. (and the demographics of 2016 make 1980 comparisons nonsense).
There is no way you can make guesses at the general election at this point— so much is yet to come— like vp picks— like conventions, like debates.. like FBI reports about handling classified material.. etc.. the polls for the general mean less than nothing right now...
And you believe the polls saying that? This far out? Do you also have a Unicorn farm?
Look Hillary supporters we know there will be hundreds of bogus pols out to try to trick people into not voting for Trump.
Problem you have is Trump’s America first strikes a survival cord with Americans. No amount of bogus polling push polling hit pieces and vicious dishonest reporting is going to have much effect that you want.