Internet Ronin thinks that the Democrats to watch in CA are AG Bill Locker and Insurance Commissioner John Garamendi.
And he is right about Simon (if he runs) and Issa splitting the conservative vote. However, I don't think that that is good news for Simon, rather it is good news for Arnie. Arnie may have some trouble with the staunch conservatives in CA, and if Issa and Simon split those votes, then that will dilute their significance.
And I think this is correct:
The Republican base continues to be energized while the Democratic base is increasingly demoralized. This does not bode well for a large liberal turnout,