Who's behind the attacks on a health care overhaul?

Much of the money and strategy behind the so-called grassroots groups organizing opposition to the Democrats' health care plans comes from conservative political consultants, professional organizers and millionaires, some of whom hold financial stakes in the outcome.

If President Barack Obama and Congress extend health insurance coverage to millions of uninsured Americans, raise taxes on the wealthy to pay for it, and limit insurers' discretion on who they cover and what they charge, that could pinch these opponents.

Most of them say they oppose big government in principle. Despite Obama's assurances to the contrary, many of them insist that the Democrats' legislation is but the first step toward creation of a single-payer system, where the federal government hires the doctors, approves treatments, sets the rules and imperils profit.

These opposition groups appear to have spent at least $10 million so far on ads attacking the Democrats' plans. Still, supporters of a health care overhaul have outspent opponents by more than 2-to-1 so far, according to Evan Tracey of the Campaign Media Analysis Group, which tracks ad spending. Supporters include drug makers angling for their own protections, unions, the American Medical Association and AARP, the seniors' lobby. Supporters announced this week that they intend to spend $150 million promoting an overhaul.

The opposition groups' names sound catchy and populist: Patients First. Patients United. Americans for Prosperity. Conservatives for Patients' Rights. FreedomWorks. 60 Plus. Club for Growth.

Here's who's behind them: