I think a democratic vote is 50%+1. We have a 60% rule for our budgets and that process is a mess, so is the new found Republican love of the filibuster rule in the Senate, something they will rue with great sorrow before all is said and done.
And I do Critical Mass. I love it. It's important, and its a reason why SF is such a bike friendly city, and doing more work on bike routes all the time. Critical Mass is what real democracy smells like.