By Trevor Hunnicutt OCEANSIDE, Calif. (Reuters) – U.S. President Joe Biden on Thursday vowed to “free” Iran, and said that demonstrators working against the country’s government would soon succeed in freeing themselves. “Don’t worry, we’re gonna free Iran. They’re gonna free themselves pretty soon,” Biden said during a wide-ranging campaign speech in California, as dozens of demonstrators gathered outside holding banners supporting Iranian protesters. Biden did not expand on his remarks or specify what additional actions he would take during the remarks at MiraCosta College near San Diego. The…