Highly competitive purple states (Colorado, Iowa, Michigan, New Hampshire, North Carolina). These are the five competitive Senate races — all seats are currently held by Democrats — in states generally considered presidential swing states. It’s here where Democrats have gained ground. There have been numerous recent polls in North Carolina, including two released on Monday, showing Democratic Sen. Kay Hagan ahead. Her odds of holding her seat have improved to 68 percent from 46 percent when the model launched.