The best-kept secret in this presidential campaign is Barack Obama's substantial package of middle class tax cuts--most political junkies can't even tell you what's in it and most working-class swing voters don't even know it exists. Indeed, those voters would be shocked to discover that, according to independent analyses, Obama is offering 80% of Americans four times as much in tax relief as McCain on average. The next best-kept secret of the campaign, and arguably the biggest mystery, is why has Team Obama seemingly been hiding this electoral haymaker? Even worse, why have they been letting their opponents con the...