SAN FRANCISCO - APRIL 23:  California attorney general Jerry Brown (C) looks over a copy of a lawsuit before speaking at a press conference April 23, 2009 in San Francisco, California. Brown filed a $1.5 billion lawsuit against three affiliates of San Francisco based Wells Fargo Bank for defrauding California investors who purchased auction rate securities thinking the investement would be as safe and liquid as cash. Getty Images logo Getty Images 7 months ago

SAN FRANCISCO - APRIL 23: California attorney general Jerry Brown (C) looks over a copy of a lawsuit before speaking at a press conference April 23, 2009 in San Francisco, California. Brown filed a $1.5 billion lawsuit against three affiliates of San Francisco based Wells Fargo Bank for defrauding California investors who purchased auction rate securities thinking the investement would be as safe and liquid as cash.