In fact, its recommended you do keep advocating for it. If you try to persuade people of your ideas, you often improve the ideas and even if you don't get what you want, you often get people part of the way towards your position.
So if your idea does not win a majority vote then you must improve your idea?
Or improve your presentation of it. Or sometimes simply times change and people wake up to the value of your idea. And sometimes, you have to accept that it may be 50 years hard work for your idea to be accepted and knuckle down. Look at Ron Paul and Ralph Nader. Neither will ever be President but both are committed to a lifetime of fighting for their ideals.
Just because you lose an election doesn't mean you are wrong and have to give up.
