Ryan--why no poll bounce?

Paul Ryan is popular with big crowds at all his appearences.  That being said there is no polling evidence that he has made Romney more popular.  Is Ryan a bad pick or are the polls biased?  I think Ryan is a good pick and I believe he has made Romney the favorite.  Right now I believe polls are biased and off.  I believe that the polls oversample Democrats and the often do not look at likely voters but at all possible voters.  We also see many MSM outlets who want the President reelected.  Since the Ryan pick I see all the energy with the Republicans and until I see some change I believe Romney is likely to win.