I have a passport, but since Indiana has secure licenses, and they cost $10, I got one. I had to show my passport to get it (could have shown my SS card, but my passport was handier). Also had to show my voter’s registration card to prove my state residence. Could have shown a lease, or a utility bill less than two months old.
Indiana allows you to have a state ID in addition to a driver’s license. I suppose if I traveled extensively within the country for work, or something, I’d get one and keep it in a different pocket, in case I lost my wallet. I don’t want to have to keep track of my passport if I don’t need to, considering what it cost, and how much trouble it is to get one. If I didn’t have a back-up state ID, and did some extensive in-state travel for say, a month, where I had six or seven flights, and a lot of money invested, I suppose I’d bring my passport, but for a weekend round trip, or a week-long trip to visit family, which is what my flights usually are, I’d just take my drivers license and hope for the best. I usually carry my voter’s registration card and my insurance ID. I guess I could put them in a different pocket so I’d have something. Maybe I’d bring my SS card and my birth certificate.