From the Atlantic:
Fully 60 percent of whites nationwide backed Republican candidates for the House of Representatives; only 37 percent supported Democrats, according to the National Election Poll exit poll conducted by Edison Research. Not even in Republicans' 1994 congressional landslide did they win that high a percentage of the white vote.
Moreover, those results may understate the extent of the white flight from the Democratic Party, according to a National Journal analysis of previously unpublished exit-poll data provided by Edison Research.
The new data show that white voters not only strongly preferred Republican House and Senate candidates but also registered deep disappointment with President Obama's performance, hostility toward the cornerstones of the current Democratic agenda, and widespread skepticism about the expansive role for Washington embedded in the party's priorities. On each of those questions, minority voters expressed almost exactly the opposite view from whites.