I'm afraid there's no simple shortcut to knowing what the future will bring. The study of history and politics is a lifelong endeavor. Start perhaps with the Old Testament and then Plutarch's Lives of the Noble Greeks and Romans.

If you want a shortcut, the only one that works is to find someone whose knowledge and judgment you can trust. That could be a celebrity commentator, or it could be your father. Plumb the depths of their knowledge by asking questions, and challenging the answers, and (here's the hard part) if they prove themselves worthy, make the decision to trust their recommendation even if your emotions tell you to vote the other way.