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WASHINGTON – President Barack Obama once told Democratic lawmakers they'd be proud to campaign on historic health care legislation. Six months later, the only Democrats running ads about it are the ones who voted "no."Now, with crucial midterm elections approaching, the White House is preparing to use the law's six-month anniversary to reintroduce it to skeptical voters and trumpet new reforms that are taking effect, such as new coverage for preventive care and young adults and a ban on canceling insurance for someone who falls ill.