Typically I would say that a constitutional amendment is not necessary if a federal election is involved but since states have control of the actual election procedures I might agree with you. I abhor amending the constitution unnecessarily.
By state law, Indiana requires production of a photo ID at the polling place. Usually, a drivers license serves the purpose, but for those who don’t have a license, a state issued ID card is available for free. The 7th Circuit has upheld this law.