What I would Like to see is the primaries held throughout the country on the same day. By the time the primaries hits the west, it has already been decided who the canidates are going to be.
Ummm... have you read a newspaper lately? There's only a handful of states left, and the race is still on.
Besides, a nation-wide primary simply puts the small states back into absolute invisibility. Why would any candidate campaign in small states in the primary with so few delegates when time is so precious?