Carter trailed for basically the entire race. Reagan gained in the final week.
Perhaps I'm not stating my point well. I'm not claiming that Carter had a lead and a win Reagan win shocked everyone. I'm claiming that only the absolute final 1980 polls (literally the weekend conducted and Mon/Tuesday released polls) caught wind of what was about to happen. There was a broad consensus that election night 1980 was going to be a long one, a nail-biter. It turned out we all went to bed fairly early that night.
Let me try to state it this way:
Lots of people here have only learned the lessons of 2008 & 2012. That is, the polls one or two weeks out are stable and fairly accurate. The implied assumption being that a late break of 5-10 points just doesn't happen (anymore).
Don't mistake my point as being that Carter was ahead and lost. I am not claiming that. My point is that Carter and Reagan were very close, within the margin of error through all of Sept/Oct. "Too close to call" was the wide consensus through the entire fall of 1980.
Yet a late break led to a R+10 result.
My point being, plenty of people here don't know what a late break like 1980 looks like. It's made more difficult by the change in polling methodology and the sheer quantity of publicly available polls now (that we didn't have in 1980).
It *might* (emphasis on might) be that a late break in the modern polling era looks a lot like what we are having now. Big volatility in polls, "outliers" galore, and relatively wildly divergent models showing us irreconcilable differences like we are getting this week. This is conjecture on my part, I readily concede that. But I lived through 1980 and remember how shocking the R+10 result was on election night. Not so much that Reagan won, but that he won so big.
I'm not proposing Trump can win by 10 here. I'm am proposing that 1980 race shows us that Clinton +2 to +4 right now may not be as safe as it seems.
We'll know in only days.