JUST WHEN YOU THOUGHT IT WAS SAFE TO... Paul Krugman recently used his NYT column to eulogize James Tobin, the Nobel Prize -winning economist who taught at Yale and served as an adviser to President Kennedy. Krugman's description of Tobin's work (and his usage of Tobin's government service to - surprise! bash everything connected to the Bush administration) is criticized by Ben Stein (yes, as in "Win Ben Stein's Money.")