Mr Fillon, who was prime minister under President Nicolas Sarkozy until his electoral defeat in May, has likened Mr Cope's allies to "a mafia" while his rival has described him as a "sore loser".
McCain's future, in large measure, will depend on whether the voters in Michigan see his words through the prism of Theodore Roosevelt -- the heroic victim of dirty pool -- or through the prism of Bob Dole -- the snappish temper tantrum of a soreloser.