The Florida Dept. of State estimates a new primary would cost $20 million, and would require 90 days to set up after a decision is made. Time is getting short.
In Michigan, the Democratic party seems to have agreed that taxpayers should not pay for any revote. No estimate on the time factor there.

"All that is needed is a large bunch of rooms." Nonsense. The facilities to handle over one million voters in each state must be paid for, staffed, heated and/or air conditioned for comfort, sanitation and safety, and prior committments deep-sixed (and compensated for!).
In Michigan, some 600,000 Democrats and some 850,000 Republicans voted in the primary. In Florida, about 1.7 million Democrats and over 1.8 million Republicans voted.

Quick solution- since the Republicans beat the Democrats in sheer numbers in the primaries in both states, why not just withdraw and concede to MCain?
He, he, he, haw!