Romney's frontrunner status depends on the Michigan primary

from Commentary Magazine:

The irony for Romney is that of all the upcoming primaries, Michigan may be the best suited to respond positively to Santorum’s paean to rust belt values. Romney’s inability to connect with both conservatives and ordinary voters has handicapped him throughout the race, but in Michigan, with its depressed economy and dependence on the auto industry, it is as much of a hindrance as in the general election. Michigan, with its high unemployment and working class electorate, provides Santorum with a receptive audience for his own version of class warfare politics.