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States with laws binding electors: Alabama, Alaska, California, Colorado, Connecticut, DC, Florida, Hawaii, Maine, Maryland, Massachusetts, Michigan, Mississippi, Montana, Nebraska, Nevada, New Mexico, North Carolina, Ohio, Oklahoma, Oregon, South Carolina, Vermont, Virginia, Washington, Wisconsin, Wyoming
Keep in mind that just because a state has a law requiring an elector to vote a certain way does not mean the elector must do so. People break the law all the time, and a would-be faithless elector could change his vote and just face the consequences. However, no faithless elector has ever been punished for his vote. In North Carolina, South Carolina, and Michigan, faithless electors are replaced before their vote can be sent to Congress.