“You are neither right nor wrong because the crowd disagrees with you. You are right because your data and reasoning are right.”

Mike, if ad populum fails, use ad hominem.

I like it a lot; anonymous, I really like yours also, if you can't prove you are right through the masses propaganda, attack the messenger - straight out of the socialist's (communist to fascist; liberal to conservative, progressive to neo-con, etc.) hand book. It fits the quote well.

If the crowd agrees with you, you are probably wrong.

My dad ( wise man ) science teacher used to tell me to be careful with "I can prove it." What you need to say is, " I can offer evidence." Remember, "The atom is the smallest particle of matter," and "the world is flat." Proof ? Nope .. assertions ... which had yet to be supported by evidence.