WASHINGTON  Richard L. Scott is unusual in these tough economic times: a rich, conservative investor willing to spend freely on a political cause.

Mr. Scott is starring in his own rotation of advertisements against the broad outlines of President Obama’s health care plans. (“Imagine waking up one day and all your medical decisions are made by a central, national board,” he warns in a radio spot.) He has dispatched camera crews to other countries to document the perils of socialized medicine.

He visited with lawmakers on Capitol Hill this week, and his new group, Conservatives for Patients’ Rights, has hired a leading conservative public relations firm, CRC, well known for its work with Swift Boat Veterans for Truth, the group that attacked Senator John Kerry, Democrat of Massachusetts, during his presidential campaign.

Mr. Scott’s emergence this spring as the most visible conservative opponent to Mr. Obama’s not-fully-defined health care effort has former friends and foes alike doing double takes, given Mr. Scott’s history.