Political labels have a way of eventually turning into political liabilities. "Liberal" comes to be hated as the opposite of actually liberal. "Progressive" is ultimately recognized as hindering progress and moving the world backwards. "Libertarian" falls victim to well-meaning but politically immature friends offering the public gross misperceptions.
When out there campaigning, or dealing with the media, or even talking to non-libertarians, better to use words which are hard to misinterpret or be twisted into negatives.
"Freedom fighter" doesn't work because in most people's minds someone who is fighting for something is in conflict. But conflict is the antithesis of freedom. Either we are experiencing freedom inside ourselves or we are experiencing conflict. Since we teach what we are, by zealously experiencing freedom inside ourselves we teach freedom and facilitate freedom in our outer world.
Even the labels "politician" or "political activist" do not really serve our goals. These labels historically have referred to men and women in conflict; pushing one cause, resisting another cause ... always pushing and resisting.
Better to use words which pretty much call a spade a spade. Every person knows what freedom means, because inside ourselves our spirit is free. And all people, when they pay attention to their deepest inner desires, find their spirit is zealous for political freedom which reflects their inner spiritual freedom.
Better to call oneself a "freedom zealot."
If I am a candidate, I serve my cause best by having myself introduced as, "freedom zealot and candidate for...." If I am an activist, I help myself by asking newspeople to refer to me as "freedom zealot." And it doesn't matter whether I'm talking to people who consider themselves conservative or liberal or independent, they will all feel a camaraderie with me and feel respect if I label myself a "freedom zealot."
To understand the evil psychology of modern "liberal progressives," read Ayn Rand's "Atlas Shrugged."
"God's laws will keep your minds at peace, because peace IS His Will, and His laws are established to uphold it. His are the laws of freedom, but yours are the laws of bondage. Since freedom and bondage are irreconcilable, their laws CANNOT BE UNDERSTOOD TOGETHER. The laws of God work only for your good, and there ARE no other laws beside His. Everything else is merely lawLESS, and therefore chaotic." -Jesus Christ in A Course in Miracles