One task I have quietly taken on behind the scenes here at Vox Nova is acting as a sort of “copy editor” — correcting spelling and usage errors in the comments prior to approval by the moderators — things like “you’re/your,” “their/there/they’re” confusion, and so on.
Along the same lines, I’m also correcting the incorrect usage “Democrat Party [Caucus/Congressman/Senator etc.]” for more or less the same reason: it is incorrect usage, and can be a distraction from discussion.