California Code, Government Code - GOV § 89516

(a) Campaign funds shall not be used to purchase a vehicle unless both of the following apply:

(b) Campaign funds shall not be used to lease a vehicle unless both of the following apply:

(c) Campaign funds may be used to pay for or reimburse the operating costs, including, but not limited to, insurance, maintenance, and repairs, for any vehicle for which campaign funds may be spent pursuant to this section.

(d) Campaign funds may be used to reimburse a candidate, elected officer, a candidate's or elected officer's immediate family, or any individual or individuals with authority to approve the expenditure of campaign funds held by a committee, or an employee or member of the staff of the committee or of the elected officer's governmental agency, for the use of that individual's vehicle at the rate approved by the Internal Revenue Service pursuant to Section 162 of the Internal Revenue Code   1 in connection with deductible mileage expenses under the federal income tax law, if both of the following requirements are met:

(e) For the purposes of this section, use of a vehicle is considered to be directly related to a political, legislative, or governmental purpose as long as its use for other purposes is only incidental to its use for political, legislative, or governmental purposes.