For more than a decade, the Democratic Party -- the self-proclaimed party of the middle class -- has consistently lost the middle class at election time. In 2004, voters with family incomes between $30,000 and $75,000 went for Bush by 6 percentage points, while Congressional Democrats lost this group by 4 points. Among white middle-class voters (one-third of the electorate), Bush won by 22 points and Congressional Republicans by 19 points. What's the matter with the middle class? Democrats like to pin their defeats on national security and culture issues alone, but the progressive economic message is also to blame....