A democrat need not believe that the majority will always reach a wise decision. He should however believe in the necessity of accepting the decision of the majority, be it wise or unwise, until such a time that the majority reaches another decision.
If you've got a desire to achieve something, then keep going until you achieve it. It's not always possible and things might change - circumstances may change or adversity or obstacles may come your way - but keep trying. I feel that I've tried to do that in my life and it's something that I've tried to pass on to my children as well.