Oil companies are usually powerful. But in California, the education lobby is more powerful.
Want to know about lobbyists in California? Look here.
Some lobbyist profiles:
Institute of Governmental Advocates ethics code.
FPPC information on lobbyists
From the CA Lobbying Disclosure Information Manual: "Gifts made directly to members of an official’s immediate family are not subject to the gift limits unless the family member is also a public official described above, but are subject to disclosure on quarterly reports"
There are limits on gifts, but members have used campaign funds for personal purposes: