Institute for Legal, Legislative and Educational Action
This is not a new concept. Read the article that quotes a decision from Pennsylvania In Prigg v. Pennsylvania (1842).
http://tenthamendmentcenter.com/2013/12/28/states-dont-have-to-comply-the-anti-comandeering-doctrine/?doing_wp_cron=1388239250.1749649047851562500000#.UsN2QSIo6tW