I hope you recognize that I was talking about something very specific when I commented "So what if it is not in the Constitution." And I was replying to someone who was arguing against filibusters because they're not explicitly provided for in the Constitution. It should be quite clear why something like the filibuster would not be noted in the Constitution...
FTR: I am not against the filibuster. I think it can be abused but I think protecting the right of the minority is a good thing.