WASHINGTON -- A Republican group backed by the casino magnate Sheldon Adelson is starting a new effort in battleground states to win over Jewish voters who could be persuaded to turn away from President Obama and support Mitt Romney.

The group, the Republican Jewish Coalition, plans to begin a multimillion-dollar advertising campaign in the coming weeks called ''My Buyer's Remorse,'' targeting voters in Florida, Ohio and Pennsylvania, aides said. The campaign uses testimonials from people who say they regret supporting Mr. Obama because of his economic policies and his posture toward Israel, in hopes of cutting into the wide advantage Democrats have held over Republicans among Jewish voters.

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