I just don't think that's possible for them. In school, all that stuff about past participles that no one ever understood would now make no sense to anyone. Verb tenses would be out the window. Conjugation would be a profanity. Psychics would predict what happened yesterday.
Skeptics scoff that no one can tell the past.
In reverse time, I'd even vote for Bush. I'd never remember doing it anyway. And here's my cynical two cents on politics. It would make just as much sense as anything else. They don't even know what taxes are.