Denver-based GOP operative Katy Atkinson said that in a state as close as Colorado, the ground game may make all the difference.
"The Democrats have spent a lot of money registering new voters, and those can be the toughest to turn out. So they have the tougher job, but they also have a very sophisticated program," Atkinson said. "If anybody can do it, the Obama people can. But that's the whole question in Colorado."