It's very significant that in Pennsylvania, Id's will not be required to vote. This should help the Democrats since they are less likely to have appropriate identifications or are too disorganized to produce one at the polls.
Mary Republican has a maid to watch the kids when she is at bible studies. On the way home she can vote and produce a driver's license and a passport.
Under the voter ID law:
Mary Democrat arrives at the polls five minutes before the polls close. Her kids are left in her car and are making a lot of noise. Mary Democrat gets distracted and leaves her pocketbook in the car. It has all her identification and by the time she realizes she doesn't have it she can't vote because the polls are closed.
With the new ruling:
Mary Democrat can vote because the won't ask for ID.