Before 1964: That one day the Democratic Presidential candidate will consistently carry every, or all but one county in Vermont. And that the governor will be a Democrat, one out of the two senators will be a democrat, and the other one will be a socialist who is a de facto Democrat, and that the Democratic Party will have huge majority's in both state houses. And pretty much the same thing will happen to the Republicans in Mississippi and Alabama.
But then just to mess with them, you tell them that Vermont has only ever elected 1 Democrat to the US Senate.