Michael Barone takes a close look at it:
[Excluding Missouri] I find that 10,715,721 votes have been cast so far and that 10,428,036 votes were cast in those states’ primaries in 2008. That represents a turnout increase of 2%. The story line has been that dropping turnout is bad news for Republicans, because it suggests even less enthusiasm and interest than in 2008, which was a dismal year for the party. The 2% rise is better news for Republicans, but not very much better. It’s a very small increase, less than the population increase in four years, and from a relatively low base, since Democrats had far greater primary turnout in 2008 than Republicans did.
The Dish 