Here are the combinations to get the brass ring(calculations courtesy of Advancing Wisconsin):
Iowa, Colorado, New Mexico: 273
Iowa, Colorado, Nevada: 273
Iowa, New Mexico, Nevada: 269 US House decides
Iowa, Colorado, New Mexico, Nevada: 278
Iowa, Virginia: 272
Virginia, Colorado: 271
Virginia, Nevada, New Mexico: 272
No matter how you slice it and dice it, this is going to be a very, very close election. The McCain attack machine is doing an outstanding job getting their desired results.