Whose income decline worries the politicians most?

News Item 2
    Official figures released in the United States, the world’s largest economy, show that the income of the average household fell last year and that more Americans than ever are living in poverty.
    Yet again, figures which show that the economic recovery is not being felt by America’s less advantaged citizens. African Americans and Hispanic communities are disproportionately affected, as are the less well-educated, the young and people living in the south. (2) It’s probably the decline in median income, down 2. 3% , that’ll worry politicians most since the battle for middle-class votes will be vital in next year’s presidential election. The figures come just as President Obama hits the road trying to sell a $450bn jobs package. He faces a painful struggle.