I've done this flight before to avoid ORD... I doubt your checked baggage will make it, but you should be ok for yourself as long as SFO isn't having issues that day. Given SFO delays, I might be a little worried, since weather (fog here and fall storms elsewhere for incoming traffic) seem to push back ex-SFO flights fairly often these days. If you would be really put out having to take a later flight, I suggest you increase your connection time. It's too bad AA stopped flying from OAK, they seemed to be far less affected by weather delays.