All of those twentysomethings who voted for Barack Obama last year are about to experience the change they haven't been waiting for: the return of income tax bracket creep. Buried in Nancy Pelosi's health-care bill is a provision that will partially repeal tax indexing for inflation, meaning that as their earnings rise over a lifetime these youngsters can look forward to paying higher rates even if their income gains aren't real.

Americans of a certain age have seen this movie before. In 1960, only 3% of tax filers paid a 30% or higher marginal tax rate. By 1980, after the inflation of the 1970s, the share was closer to 33%, according to a Heritage Foundation analysis of tax returns.