Democrats are increasingly anxious about an onslaught of television ads hitting vulnerable Senate and House candidates for their support of the new health law, since many lack the resources to fight back in the early stages of the midterm campaign.
Since September, Americans for Prosperity, a group financed in part by the billionaire Koch brothers, has spent an estimated $20 million on television advertising that calls out House and Senate Democrats by name for their support of the Affordable Care Act.