Obama Suprise Endorsement Watch

At the big Oprah/Michelle Obama rally today in California, Maria Shriver unexpectedly showed up to endorse Obama. kos gets a little breathless about it:

Update: Keep in mind, this is now top-of-the-fold news in every California newspaper tomorrow, it will lead every newscast. And it should push into Tuesday as the governor is forced to answer questions about it.

Well played, Obama campaign. Well played.

Update II: Shriver just said that she decided this morning to speak. It wasn't planned. So maybe it wasn't well played by the Obama campaign. Maybe they just got damn lucky.

UPDATE: Joan Baez, too, randomly, in a letter to the editor of the San Francisco Chronicle.