Would it not be more progressively liberal to invite all those with whom the DUmmies disagree to openly register and engage in debate? This would give them the opportunity to demonstrate their skills at conversion, and not have to limit themselves to 'bouncies' from gas pumps, checkout lines, and auto dealer waiting rooms.
There is nothing for them to fear with that, because they are ever-so-much smarter than everyone else. I know they are, because they tell us they are. (They're not lying to me, are they?)