Voter ID laws just require you to show them your Driver's License, which you need for just about everything else. The left doesn't like that because it makes it harder for them to rig the election. Even then, it's not enough.

You mentioned fingerprints, and I don't see why kids have to give their fingerprint to get lunch (when I was in school they made us use a scanner, but that switched to an ID a few months before I graduated) but we don't have to in order to vote.

In India they mark voters's fingers with ink, and it's actually become a symbol of voting. They've done that since 1962.