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<p>California insurers have pumped more than $12 million over the last five days into a campaign to defeat Proposition 45, an initiative on the Nov. 4 ballot that would regulate health insurance rates.</p>
<p>Blue Shield gave $2.66 million, WellPoint $6 million, Kaiser Permanente $3.73 million and Health Net $350,000, according to late filings at the secretary of state's office.</p>
<p>The latest contributions boost the No on 45's campaign kitty to $55.4 million, while proponents report having raised only about $2.5 million.</p>