Waste of time. You are not just asking them to change their opinion on one subject, you are asking them to change their entire mind set. Liberal is a vague term, I prefer "progressive". These folks believe that the government is here to protect us from ourselves and should be involved in every part of our lives. These are the same people that feel it is OK to have "reasonable" school lunch standards that result in kids' sack lunches being searched and confiscated. They see government control as a ways to uplift the greater good. These are the "living document" folks regarding the Constitution. Staunch 2A advocates take the Constitution literally and believe that the government has a much more limited role in our lives.