Nate Cohn sees the state as pivotal:
Republicans have struggled mightily in Colorado for nearly a decade and a comeback will require the GOP to confront and overcome the forces imperiling their chances nationally. That makes the state tough for Republicans, but if the GOP can't unlock Colorado, they will struggle to find alternative routes to the presidency. Conversely, whatever Republican adjustments might permit a GOP breakthrough in Colorado would probably yield gains in demographically similar areas elsewhere, allowing them to reclaim Virginia and turn Pennsylvania into a dead-heat. In other words, if the GOP can't win back the Centennial State over the next four years, they're not likely to win back the White House.