Arizona does not observe DST, either. The whole state is in the same time zone though, so it is less confusing than Indiana.
The main reason that Indiana has been resisting daylight "savings" time all these years is because it is physically in the Central time zone, but it is legally in the Eastern time zone. Because of this, most of the state is basically already on DST year round. If the US Congress does not change Indiana's time zone to Central then they will be on "double daylight" time next summer. Sunset would be very late in June and July, and sunrise would be very late in April and October.
Wendell Sexson
Jerry Feldman