20,000 estimated in Friday's Prop 8 protest march in San Francisco

NBC Bay Area had this report of Friday's protest march in San Francisco, embedded below:


(If the video doesn't work, click through to the NBC page with article and video, here.)

And, from an insider source via Pam's House Blend, crowd estimates (which aren't released to the public usually) was 20,000 people involved in the protest.