Examples?
Try googling "Thune" + "RINO"
It isn't hard.
Here are the first three representative examples. IMO, Thune's opposition to Bolton alone proves my point.
http://shovel.blogivists.com/2008/09/09/thune-catches-rino-virus-with-anti-drilling-bill/
http://chargingrino.blogspot.com/2005/05/thune-to-oppose-bolton.html
http://www.swamppolitics.com/news/politics/blog/2008/08/senate_gangs_new_energy_plan.html