Read more here.
Remember, this is the same Eric Holder who refused to pursue charges against two bat- wielding, beret-wearing terrorists in Philadelphia, and hoped to use the effects of Operation Fast and Furious to precipitate the squashing of citizen's rights under the 2nd Amendment.
Here's the bottom line: we can't buy Sudafed or Claritan without showing an ID. I can't board the Cape May-Lewes Ferry without showing an ID. ID's are used to match voters with voter roles, preventing fraud. Removing the ID requirement on election day will only take the opportunity for such fraud and cause it to explode geometrically.