I have sort of been following this because Kay over at Balloon Juice has being doing stellar work following these bills. Many of the problems that she (and others) have pointed out are as follows: (and this is certainly not exhaustive)
1. There have been little or no verified instances of "in person" voter fraud. Despite what the Repubs tell you dead people are not voting in large numbers. There is a much larger instance of voter fraud in mail in ballots, but none of these new Voter ID laws would affect mail in ballots. The reason is that the majority of people who use mail in ballots tend to be older people who statistically tend to vote Republican.
2. While the States are supposed to be offering "free" ID cards for anyone who does not already have a driver's license many folks have been told not to inform someone that the ID card ifs free. They have been told to give free ID cards ONLY to those who already KNOW they are free.
3. Many poor urban areas do not have DMVs. In fact in Wisconsin the Repubs passed such a law and then INTENTIONALLY SHUT DOWN DMV offices in poor urban areas and opened up more in affluent areas where their voters were more likely to reside. If you do not have a driver's license then chances are you do not own a car, if you do not own a car how are you supposed to get to a DMV to get a voter ID?
4. In order to get an ID people have been told that they must have a birth certificate. There was a story of a 95 year old lady who not only did not have a birth certificate but had no idea where she was born so had no way of getting one. She offered them a copy of her marriage certificate but was told that it was no good. She was one of the cases highlighted to show how unfair this law is.
The bottom line is that the Republicans know that their base is diminishing, the older, white voters are dying off, and they have alienated every other group. They cannot win an election fair and square if everyone eligible gets to vote. The only way they can win is to make sure that those who would vote against them can't.
Here is a piece by Kay over at Balloon Juice on the recent ruling out of Wisconsin.
http://www.balloon-juice.com/2012/03/13 ... -airplane/