Conservative advocates funded by the billionaire industrialist brothers Charles and David Koch have launched a massive campaign pressuring states to deny health care coverage to lower income Americans through the Medicaid expansion contained in the Affordable Care Act.

The effort, orchestrated by the group Americans for Prosperity, is targeting lawmakers in Virginia tasked with deciding whether the state should accept federal dollars to provide insurance to individuals and families below 133 percent of the federal poverty line ( $31,321 in income for a family of four). Volunteers with the organization are distributing flyers through door-to-door canvassing, attending committee hearings, and according to one lawmakers who has become a target of the campaign, intimidating constituents.

More: Billionaire Koch Brothers Spending Millions to Deny Health Coverage to Low-Income Americans