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The advocacy group started by President Obama’s former campaign officials began its first advertising campaign on Friday, pressuring 13 Republican lawmakers in their home states to expand background checks to all gun buyers.

The ads, which include the legislators’ photos and Twitter handles, are running on local news Web sites in their home districts. In total, the ads cost close to six figures and represent the first paid media campaign by Organizing for Action, the group formed last month to use Obama’s campaign apparatus to mobilize support for his legislative agenda.

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