BOB CORKER has introduced his new spending-cap bill. Among other things, it would “Put in place a 10-year glide path to cap all spending – discretionary and mandatory – to a declining percentage of the country’s gross domestic product, eventually bringing spending down from the current level, 24.7 percent of GDP, to the 40-year historical level of 20.6 percent.” I’d prefer 18 percent, but I’ll take this if I can get it.