Devvy did some research on this and found:
"Section 274 of the Immigration and Nationality Act, which provides criminal penalties for any act that "encourages or induces an alien to come to, enter, or reside in the United States, knowing or in reckless disregard of the fact that such coming to, entry, or residence is or will be in violation of law." 
"Encourage" and "induce" include actions that permit illegal aliens to be more confident that they could continue to reside with impunity in the United States, or actions that offer illegal aliens "a chance to stand equally with all other American citizens." 
"To prove that a state or local government agency "encouraged or induced" illegal Mexican aliens, all the government needs to establish is that the agency knowingly helped or advised the aliens, or emboldened them, or made them more confident in their continued illegal residence in the United States. 
"The courts have held that INA §274 is to be broadly construed both as to those persons subject to criminal liability under the statute,  and as to the types of activities covered therein. "
By giving illegal aliens driver's licenses, those state legislators have encouraged illegals to come to, enter and reside in the U.S. in violation of the law. Those state legislators have "emboldened them" and have made illegals more "confident" in their continued illegal residence in the U.S.
Where is the Federal Department of Justice? They are supposed to ensure federal laws are enforced and when violated, go after the lawbreakers. Well, the answer to that question is simple: The DOJ has become so politicized, the Attorney General (past and present) does what his/her masters tells them and we the people suffer. Eric Holder should have been indicted for obstruction of justice. Instead, he's Obama's top lap dog.
Make no mistake: The battle to reward illegal aliens for breaking into our country, stealing jobs and drowning us in crime is about to heat up once the outlaws come back from their Christmas recess. We defeated these lawbreakers in Congress before and we must do it again.
There should also be a loud outcry by the people of those four states to their U.S. Attorney (which has jurisdiction over their area) to indict every single member of those four state legislatures who voted to give illegal aliens driver's licenses. Silence is not an option. My daughter is a victim of illegal aliens driving on our roads and highways. Don't think your family member won't be next. The actions of those legislators and Congress has spread now to a college professor who should be charged under Section 274:
"Ricardo Dominguez, a University of California, San Diego tenured visual arts professor and activist, designed the Transborder Immigrant Tool, an application much like a global-positioning system used in cars, to help illegals find the best locations for food, water and groups to assist them as they sneak into America."