“It is not President Obama’s prerogative to decide which laws matter and which do not, nor his right to challenge constitutional amendments duly passed by the various states,” said the measure’s sponsor, Rep. Tim Huelskamp (R-Kan.). “The Justice Department is duty-bound to enforce DOMA and to not do so is a flagrant disregard for the Constitution and for the rule of law.”President Obama is not "challenging" any state constitutional amendments. Eventually, Olson and Boies will get around to doing that. More importantly, apparently Rep. Tim Huelskamp (R Pluto) does not remember all of those Bush signing statements. Those informed various parts of the executive branch how laws are to be enforced
By the way, Tim, the Justice Department is enforcing DOMA. They are not defending it in court which most certainly is a presidential prerogative.