Do they?? There was a discussion recently on www.nasaspaceflight.com/forums in which it was said that SpaceX can't fly out of Vandenberg...
The old Vandenberg SLC-6 pad that was designed for shuttle was turned over and modified for Atlas V IIRC and would require mods for use by SpaceX...
Later! OL JR
SpaceX Linky
Take a look at the launch manifest for 2012.