Why do you think open voting by "declared Republicans" is a good idea?
In all of these states including Florida. Romney is dumping all of his money to guarantee he wins each race. Thus the media props him up as the front runner and automatically claims him as the nominee.
If all 50 states voted at once. Romney couldn't spend his way in. The voters would vote based on debate performances and ideas, as opposed to the lies spread by Romney about his liberal record which he is trying to erase from history.
I too would like a national primary DAY;and further you would have to be registered as a party member at least 30 days in advance in order to vote in the primary.