The intersection at "Grove and Van Ness [is] corked by 200 protesters, more coming from civic center," says Jim Herd who is live on the scene. Traffic is blocked as far as he can see. Cops are on the scene now. As we already mentioned, there is "lots of screaming at Civic Center plaza...[t]he goal, it seems, is to block all lanes of traffic." The protesters, according to a hurried KRON 4 reporter, plan top stay until they are arrested. (For more updates on what's going on at Civic Center, go here.)
The California State Supreme Court, for those of you just tuning in, ruled to uphold prop 8.
But! Please remember that this is just one day, that same-sex marriage will be legal soon.
Update: 10:30 a.m.: According to SFist commenter FYoCouch247, "Police deploying behind City Hall. Marchers have locked arms and will likely get arrested at some point. Avoid MUNI lines 47, 49 and anything on Grove. Hell, avoid all of the Civic Center if possible. McAllister is traffic cop moderated."
Update 10:45 a.m.: According to stop8dotorg, "Crowd very sad. Everyone in should attend tonight's rallies, happening all over country." We agree.
Update: 11:40 a.m.: stop8dotorg also says "Arrests starting in 10 mins say cops. Rumor is that people will be taken to Bryant St jail." Protesters are "singing" that they will not be moved. Oh, and check out SFAppeal's live blogging on today's ruling too.