Cracked released a video: Why They're Lying To You About Voter Fraud
It is a decent summary of the situation. What I didn't know was about Let America Vote.
Extreme voter suppression laws that disproportionately impact people based on their race or ethnicity, gender, age, or income have started popping up all over the country. If we don’t fight back, more and more Americans will become disenfranchised.
I haven't heard anything weird about California, and it doesn't show up on their map, but I will be keeping an (automated, software-based) eye on voting rights.
Also, I think there may be laws in California that prevent people convicted of certain crimes from voting...