According to Yahoo, recent Gallup poll information shows that more Independents are siding with the GOP and Obama's approval rating has dropped below 50% among the same group.
Currently, 46% of Independents side with the GOP and 32% side with Democrats, mainly because they feel that Democrats have become too
liberal. 51% of Independent registered voters disapprove of the job Obama's doing. 71% of Independents who disapprove of Obama's performance say they would vote for the GOP candidate in their district if the election were held today. Only 63% of Independents who approve of the job he's done so far would vote for him again. Source
Party affiliation has changed over the past two years as well. According to a June 2008 survey by Rasmussen Reports of 15,000 American adults, 41% identified themselves as Democrats. In June 2009, the number dropped to 38.9% and it dropped again in 2010 to 35.4%. The number of American adults who identified themselves as Republicans slightly rose in those years. In June 2008, 31.5% identified themselves as Republicans. In June 2009, it increased to 32.2% and increased again in June 2010 to 33%.
The number of people who stated they weren't affiliated with either party is currently 31.6%. Source
What do you think is causing this change? Some say it's simply disappointment in Obama's performance, but could it also be caused by a shift in the attitudes and values of our culture?