Paid lobbyist
Political Reform Act [pdf] - $2000+ month above travel expenses - Cal. Gov. Code § 82039 (a). Paid Lobbyists Must Register with California Secretary of State

Friend, Foundation
Often trade favorable tax status for lobbying restrictions (NOT BANNED THOUGH) - IRS Pub 557 p. 45 [pdf]

Citizen
FREE SPEECH but must report express advocacy $ Political Reform Act

Trustee