If you have the option, you may want to look into the nursing program at the University of Arizona in Tucson. It's a better program than ASU's and Tucson is slightly more liberal than Phoenix. It's also not quite as hot at night, which starts to matter after your 5th month in a row of 100+ degree days.
That being said, I've lived in both Phoenix and Denver and I would choose Denver. Denver has a far better economy, better infrastructure, better schools, better weather, better quality of life overall, etc... Denver is also much, much more liberal from my experience.
If you do choose Phoenix, take the other poster's advice and live in Tempe. It's an island of intellectual civility in an otherwise hyper-conservative, right-wing-radio driven place.
Good luck in your decision!
