Is public debate on the Internet polarizing? Some scholars warn that the Internet is an ‘anti-commons’ where political positions are extreme, while others view the Internet as a moderating influence on political polarization. We examine polarization trends in a regional, Utah-based news website, with a random sample of 1768 comments over a two-year period. Focusing on the most contentious issue during this time—immigration—we find that extreme anti-immigrant sentiment decreases over time despite key political and religious events. We argue that emerging public spheres, like newspaper discussion forums, might reveal a general public inclination towards moderation during heated national and regional debate.