That's because Prop. 14, which passed by a narrow margin in June, 2010, has now taken away the write-in space for all of the U.S. Congress and state legislature races! So if you're opposed to this, you can go to the following website to protest this lack of choice (and to indicate whom you would have instead voted for): http://www.CaVoterChoice.org
Marsha Feinland of the Peace and Freedom Party was on the ballot for U.S. Senate in June of this year, but due to the way that Prop. 14 works, she wasn't allowed to be on the ballot this November! Yup! -- only the "usual Dems and Repubs!" were able to get on! (Info about Marsha is at: http://www.feinlandforsenate.org/ ).