Congress will soon vote on massive health care legislation—and on the amount of power the federal government will have over the entire U.S. health care sector. Many economists, politicians, and American citizens want to know: How many people could lose their current health insurance and end up on the so-called public option, a new government-run health plan? The numbers being tossed around are as dizzying as the array of health care bills. This report details five estimates—and what they mean for millions of Americans.