PAUL HOLMES: Citigroup's dealings with Grubman highlight why corporate America is lacking credibility

When the full story of this year's corporate scandals is written, the deal under which Citigroup CEO Sandy Weill helped analyst Jack Grubman get his twins into preschool at Manhattan's 92nd Street Y probably won't merit much more than a footnote. But PR people have been scrambling to either deny or explain the sordid trade-off, not exactly covering themselves in glory in the process.