Ok, so work keeps taking me to the same places, so I'm going to have to make a concerted effort to go to all the states I haven't been to (18). Since writing this post I've only been to one state I hadn't been to before (New Jersey).
I think I'm going to do a Maine & Massachusetts this year. Then I'll make plans to go to two unconquered states a year until this list is depleted:
Anyone want to be my travel buddy? :)