Denver Post:  “A federal court has thrown out a 2010 Colorado law meant to spur online retailers like Amazon to collect state sales tax. . .  . ‘I conclude that the veil provided by the words of the act and the regulations is too thin to support the conclusion that the act and the regulations regulate in-state and out-of-state retailers even-handedly,’ [Judge] Blackburn wrote in his opinion.  The law and the rules to carry it out ‘impose an undue burden on interstate commerce’ and are unconstitutional, the judge wrote.”