The only effect of that would be handing more power to the media than they already have to pick winners by selective coverage and spinning.
The staggered system is the only one that allow lesser known or less well funded candidates to have a shot.
This years surprise winner: Mike Huckabee.
The Media were already for a McCain vs. Rudy race last year. Your poorly thought out all-states primary would have ensured that's what we got on Everybody Tuesday.
UGH! Try again.