Skeexix, I wouldn't label you as lazy, and for the most part you ask good questions. But please don't go down the road like one or two others on this forum that indeed are lazy trolls. Everyone has Google, only apparently not everyone knows how to apply it's use - however my money is on you that you do. More precisely you can go to well known university web-sites and read a host of papers published throughout the years by professors in various related accredited fields addressing the infamous 'Party Switch' myth. 

http://www.nytimes.com/2006/12/10/magazine/10Section2b.t-4.html?mcubz=0