I'm not so sure todays action is Bernanke -- or end of the quarter window dressing for the "funds" -- I suspect the later.
End of the quarter is when many companies post their employees contributions and the funds (as dumb as they are) need to buy shares in the underlying names that they invest in... Remember that a market is made with sellers and buyers -- more buyers - the prices go up.... and these funds buy big. Add to that the Bernanke affect and we'll all have a good day!