We've always had and will always have private citizens who have orders-of-magnitude-louder megaphones: big-money bogeymen like Rupert Murdoch could be plenty effective at buying megaphones. Or think of any celebrity Twitter account, from Taylor Swift to Obama himself. And we'd disempower a variety of political activity (ostensibly) backed by the common man if private-sector labor unions couldn't spend money on politics and rich CEOs could.