From CNN:

On a slow pass through Arizona last night, Teresa took the microphone and said, “Hello, Nevada!” Kerry leaned into his fatigued wife quickly and said, “Arizona.” “Oh, Arizona!” she replied. “We’re in Arizona. We’re still in Arizona. and we are going to Nevada. If you’ve been in as many places as we’ve been in in the past 12, 13 days, even if you have a map, the hours make you mix them all up.”