In the nation's capital, Senate Majority Leader Harry Reid is on the brink of pushing through a national health program that Democrats rank alongside the creation of Social Security and Medicare. In Nevada, that very achievement is imperiling his re-election prospects. At a recent speech at the University of Nevada, Las Vegas, in front of a largely friendly audience, Mr. Reid faced a series of hecklers. When he said only in the U.S. do people go bankrupt because of health costs, a man wearing a red "Dump Harry" shirt said loudly: "It's an outright lie." Mr. Reid's plight reflects that...