BNA offers this report ($), which begins: “Candidates and office holders will no longer be able to use money from ballot measure accounts they control for purposes not directly related to those ballot measures under rules adopted by the Fair Political Practices Commission Jan. 15.” You can find the relevant documents at the FPPC website here.
I wrote about candidate controlled ballot measure committees in this Southern California Law Review article.
MORE: See also this AP report. See also this piece by Garrett and Smith.