Commerce City, Colorado (CNN) -- Maria Zepeda-Sanchez remembers the excitement of the "change" argument in 2008. "There was really a change then," she said with a nostalgic smile. "People were really anxious to have a new person." Working the phones for President Barack Obama again four years later, though, change has a new -- and to her troubling -- meaning. "Different. It's a little different," she said of the then and now reaction when calling Latino voters in Colorado. "It was more hype I think back in 2008, yes." And now? "Some people are still really excited," Zepeda-Sanchez said during a brief break from her phone bank work. "Others say, 'Oh, I don't know, well, I haven't made up my mind.'"
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Democratic strategist: "We are, I believe, at ground zero in the presidential election"
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President Barack Obama will need the support of Latinos and suburban women to win Colorado
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GOP challenger Mitt Romney will need support from the state's white evangelicals to win it
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Bill Clinton won Colorado in 1992, but lost it in 1996. George W. Bush carried it twice; Obama won it in 2008
Visits to the competing campaign headquarters and satellite offices provide instant proof of the urgent emphasis on turnout - the so-called ground game, including nudging less reliable voters to take advantage of @placeholder's early voting window, which opens October 22.