Look up how to debate. Success is not measured by how bad you make the opponent look. That may work on one person, but you have to repeat it for every person who advances the same argument. Instead, take apart their argument, reveal underlying motives, expose untruths with irrefutable documentation, uncover false logic and bad assumptions, and respond without attacking the messenger.

For instance, "The economy is terrible! Everything is so expensive." Well, stuff -is- expensive. But is the economy really the reason behind it? The US stock indexes are at record highs. Most companies have been beating the expected earnings per share. Isn't it more likely that things are expensive because companies are taking more profit to give to their shareholders? Which candidate do you believe is more inclined to change that?

The object is not to defeat the opponent. It's to prevent others from being convinced by their arguments.