Voter ID laws simply make sense and all legitimate fears can be eliminated by simply giving away free ID for people who don't have any ID ...
Realistically though, I don't think either side is taking a principled position and they're mostly focused on how these laws will impact elections. Looking at Florida voter registration since their voter ID law has taken effect it is easy to see why:
While a large portion of the "boost" in 2008 and the "fall" in 2012 can be attributed to people embracing Obama in 2008 and becoming disillusioned in 2012, I think a very significant portion of the difference is caused by people not having the ID to vote. While there is no "smoking gun" there is evidence to suggest that some of these registered voters without ID may not have had the right to vote in the first place:
In a state that is close enough that 500 voters either way can decide an election, a small portion of people voting without the legal right to can easily change the outcome of an election
