This is interesting:
In 1972, Republican voters in Michigan decided to make a little mischief, crossing over to vote in the open Democratic primary and voting for segregationist Democrat George Wallace, seriously embarrassing the state's Democrats. In fact, a third of the voters (PDF) in the Democratic primary were Republican crossover votes. In 1988, Republican voters again crossed over, helping Jesse Jackson win the Democratic primary, helping rack up big margins for Jackson in Republican precincts. (Michigan Republicans can clearly be counted on to practice the worst of racial politics.) In 1998, Republicans helped Jack Kevorkian's lawyer - quack Geoffrey Feiger - win his Democratic primary, thus guaranteeing their hold on the governor's mansion that year. With a history of meddling in our primaries, why don't we try and return the favor. Next Tuesday, January 15th, Michigan will hold its primary. Michigan Democrats should vote for Mitt Romney, because if Mitt wins, Democrats win.
It's hard to say how much of an effect Kos's latest crusade will have on the Michigan result. But with the way this primary season has gone so far, no one should rule out a Romney comeback (with or without the support of Democrats), keeping him in the race and ensuring the Republican campaign will continue for some time.