I'm not sure about that. I've posted articles about exit polls for 2006, 2008 & 2010. IIRC, moderates and independents swung 2006, and independents swung 2008 & 2010. Enter 20xxexitpoll as a keyword where xx is 06, 08 or 10. Check my posts and see for yourself.
2006 was controlled by people who don’t approve of Republican homosexuals.