As a personal level, as I drive around I notice the wealthier the area, the more Obama signs. McCain/Palin signs are frequent only in genuine middle-class districts.
But there is a more practical and effective explanation. The Hedge fund business is very heavily Jewish, particularly at the top. Not a few literally had grandparents who were dedicated Marxists or Socialists in the Bund tradition. Sudden accessions of great wealth do little to erase strong family traditions. All that happens is the already limited comprehension of how difficult it is for the average American to support a family decently is eroded further.