In the primary it doesn't matter Union memebers are all Dems. In the general Union members are what 20% of overall voters. OH I forgot You guys are going to pass the card check system. Great just what we need. Thousands of newly unionised workers going on strike driving the economy into a deep depression. Under thosse circumstances Romney could beat Obama in a landslide. I have heard this arguement of several on the left that Romney is done cause he would need the Great LAkes and he would not be supported by Unions so thats impossible. DON'T YOU BELIEVE IT. Romney is not a one region candidate. He has emense popularity out west even in states that aren't mormon like CO(2% mormon)were he got 60% without ever setting foot in the state. He also has strength in New England though it may not translate to much except a chance to win NH. Romney would have a lot of strength in the midwest despite not being like be Unions. You don;t have to be the darling of the UAW to win in IN just get more then 46% and actually organise in the state. Ohio too was very close despite the 7 point Obama win nationally. Romney can win MI, had McCain not pulled out that would have been under 8 points. and Romney can beat that definately. Plus if Chrylser or GM goes down on Obama's watch it won't look good for him.
Romney might win some primaries in the north -- in states like Massachusetts and Michigan that have no chance of voting for a Republican nominee for President in 2012.
How would Romney do in the South? Would he be a religious equivalent of Mike Dukakis? In that case the South votes in enough states for someone familiar to them that Obama wins a landslide. But that's the trouble for attempting to defeat an incumbent President: the challenger usually has too many ways in which to lose.
The GOP must win the South -- all of the South -- to have a chance to elect a President of the United States these days.