State Sen. Carole Migden has been fined $350,000 by the California Fair Political Practices Commission, the largest penalty ever levied against a candidate for state office, for dozens of violations ranging from taking campaign funds for personal use to failing to itemize political expenses, the watchdog agency said Tuesday.

Migden has agreed to pay the fine, but at least three of the five commissioners still need to approve the agreement. They are scheduled to meet Thursday to take up the matter reports the San Francisco Chronicle.

The agency’s investigation was prompted in part by a complaint filed last fall by fellow San Francisco Democrat Mark Leno, an assemblyman who is one of two Democrats trying to oust Migden in the June primary. The other challenger for the Third District Senate seat, which stretches from San Francisco to Sonoma County, is former San Rafael Assemblyman Joe Nation.

The FPPC’s initial probe concerned $397,000 in campaign credit card expenses that the senator failed to itemize. State law requires candidates to list the names and addresses of vendors being paid with a credit card for expenditures of more than $100.

But commission investigators found other violations, 89 in all, as well, the agency said. They included receiving contributions for her first Senate run before filing official papers to declare her candidacy, inaccurate disclosures of cash payments and taking $16,317 of campaign funds for the personal use of herself and an aide.

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