As part of the divorce decree my ex-spouse said he/she would pay the credit card debt. Do I still have a legal obligation to those creditors?

Your ex-spouse may be in contempt of court for disobeying a court order. However, if you are jointly liable to a creditor, your ex-spouse’s contempt of court will not excuse your non-payment. Your contract with the creditor exists notwithstanding and you are still responsible even if your ex-spouse fails to pay.