What Harry Reid did Monday afternoon gave new meaning to the phrase "public option."

The Senate majority leader, after haggling behind closed doors with members of his Democratic caucus, realized that he couldn't cobble together the 60 votes he needed to pass health-care legislation with a government-run health plan. So Reid chose another option: He shut down the private talks, booked the Senate TV studio and went public with his own proposal.

"I've concluded," he told the roomful of cameras and reporters, "that the best way to move forward is to include a public option."

For Reid, it was an admission of the formidable power of liberal interest groups. He had been the target of a petition drive and other forms of pressure to bring the public option to the floor, and...