Siebel Systems founder Tom Siebel, second cousin of Siebel Newsom, gave $50,000 to San Jose Mayor Matt Mahan's bid for California governor and another $10,000 to Republican former Fox News Host Steve Hilton. Siebel sold Siebel Systems, an enterprise software firm, to Oracle to 2006 for approximately $5.8 billion - making him a billionaire with a net worth of about $4 billion.