This New York Times article reports a Supreme Court decision allowing states to require photo ID for voting. The decision was 6 to 3 in favor of an Indiana law which requires a photo ID - driver's license or U.S. passport.
This decision is good news. It suggests that the other 20 states which have such laws will likewise withstand scrutiny. The basic thrust of photo ID for voting laws is that they tend to prevent illegal aliens from voting.
It is incumbent upon any state which passes such a law to make it easy and inexpensive for non-driving citizens to obtain a state photo ID. Otherwise it can be truthfully claimed that such laws are intended to keep non-driving urban residents from voting.