Julie
Actually, the research on class size is itself a source of contradiction and controversy.
More recent studies appear to support the long-term benefits of reducing class size. Some earlier studies had not.
It seems to me that, generally, people who want to reduce class size cite the later studies; people who want to reduce public spending cite the earlier ones.
http://www.sciencedaily.com/releases/2008/02/080228112004.htm
http://www.sciencedaily.com/releases/2009/10/091014122045.htm
http://www.sciencedaily.com/releases/2009/10/091009104649.htm
If you are concerned about class size, I urge you to keep in mind the latest state budget forecast, and the prospect of passing initiatives that will reduce state revenue, and failing to pass initiative 1098, which would help a little.